TM62100 adds MIDI and additional features to SK15, SK20, SK30 and SK50D synthesizers. It is a direct replacement for the Yamaha YM62100 / YM621 key assigner and can also be used to replace defective original ICs – even when midi is not required. The original behaviour is fully maintained.
TM62100 might also work in organs such as Yamaha D85, please read these notes.
Features:
- MIDI input and output on several channels with optional soft-through
- Independent midi control of upper keyboard, lower keyboard and pedal sections
- Full tonal range in split mode
- Midi filter cutoff and resonance control
- Additional filter LFO
- Midi sustain control
- Midi portamento control
- Midi aftertouch
- Note priority for the pedal/BASS section: Lowest/Last/Highest note
- Built in configuration menu can set midi channels and other parameters.
- Non-destructive installation can be reverted to original
Midi note control
Depending on the synthesizer, the various sound generators can be controlled independently via midi. Typically these are arranged into the same “synth-groups” that exist in the original synthesizers. Each group has its own midi channel configurable using the built in config menu.
- SK15: All sounds on Group 2 *
- SK20: No split mode: Group 1 plays organ, poly-synth and strings. In split mode: Group 1 plays Organ (all 61 notes), Group 2 plays String and Polysynth (All 61 notes)
- SK30: Same as SK20, but SOLO-Synth plays on channel 2 in NORMAL mode and channel 3 in BASS mode.
- SK50D: Group 1 plays the lower keyboard, Group 2 plays the upper keyboard. BASS Plays on Group 3. Depending on settings, SOLO SYNTH plays on Group 2 (NORMAL) or Group 3 (BASS)
* In case of the SK15, it might be possible to re-route the organ section to Group 1 by modifying the circuit. This has not been tested yet.
Additional midi control
If applicable, the following parameters can be controlled additionally:
- Poly-synth filter cutoff (All SK-Synths), with additional LFO
- Poly-synth filter resonance (All SK-Synths) *
- Sustain ON/OFF (SK20, SK30, SK50)
- Solo synth filter cutoff (SK30, SK50) *
- Solo synth Aftertouch (SK30, SK50)
- Solo-synth Portamento ON/OFF (SK30, SK50)
* For the synths with built in SOLO section, it is possible to control Poly-Synth resonance OR Solo-Synth cutoff, but not both. This is a choice you need to make during installation.
Additional Filter LFO
An additional filter LFO is accessible via midi CC controls.
- Frequency range: 0.1 Hz – 1000 Hz
- Free running or midi sync with adjustable divider
- Triangle, Saw, Inverted Saw, Square and Random waveforms
Audio frequency modulation is possible and can create novel sounds usually not possible with the SK-series synths. Warning: At high frequencies, the LFO signal may be audible. This is due to the filter IC suffering from some amount of CV bleed-through.
Midi output
TM62100 features midi output on several midi channels. The various synth-groups (see MIDI input) also apply here. This means the upper, lower and pedal keyboards can send on different midi channels. In split mode the two parts send on different midi channels as well. The channel numbers can be set in the config menu, as well as individual output channels turned off.
MIDI Soft-through
Optionally MIDI soft through can be activated using the config menu. Incoming midi messages will be merged with the internal midi data and forwarded to the MIDI output.
Configuration Menu
The built in configuration menu can be used to set parameters such as midi channels or the pedal note priority. It can be accessed turning the synth on while playing an D-minor chord.
The user manual explains this menu in detail.
Installation
Installation is relatively simple, but requires soldering and drilling holes for the midi sockets.
TM62100 replaces the original YM62100 IC. The original IC needs to be desoldered and a socket put in place. TM62100 is then put in the socket. Holes for the midi sockets need to be drilled and the sockets installed. A stencil for drilling is part of the kit. In order to get additional midi control (e.g. Filter), a few wires need to be soldered to the synthesizer’s PCBs.
Installation
Installation is relatively simple, but requires soldering and drilling holes for the midi sockets. We have a list of synth techs who can help with the installatio
How much is my shipping?
Shipping costs are calculated automatically at checkout. Simply add items to your cart and proceed to the checkout page, where you'll see the available shipping options and their prices. VAT at the applicable rate for your country will also be displayed at checkout.
European Union orders:
- Standard shipping is free on orders over €100. Express shipping is available on orders over €100, and free on orders over €400.
Poland orders:
- Standard shipping is free on orders over 250 PLN. Express shipping is free on orders over 500 PLN.
What about local taxes?
By default prices on the site include sales tax at 20%. The precise sales tax rate for your country will be calculated at checkout.
Do you ship to my country?
We ship to all EU member states from our warehouse in Warsaw, Poland. Add an item to your cart and enter your country and postcode to see the available shipping options and prices for your location. If you have any questions about shipping to your country, drop us an email at info@signalsounds.eu and we'll be happy to help.
Shipping methods
All EU orders are shipped via UPS. We offer two service levels:
- UPS Standard – our default shipping option. Delivery times vary by country (see estimated delivery times below).
- UPS Express Saver – next business day delivery to most EU destinations.
Each product page shows the estimated delivery time for your location, so you'll always know what to expect before you order.
Estimated delivery times (Standard shipping)
The times below are estimates in working days from dispatch, based on UPS Standard service. Express Saver delivers by the next business day to most destinations.
| Country | Estimated delivery (working days) |
|---|---|
| Austria | 2–3 |
| Belgium | 2 |
| Bulgaria | 4–5 |
| Croatia | 2–4 |
| Cyprus | 10 |
| Czechia | 2–3 |
| Denmark | 3 |
| Estonia | 2–3 |
| Finland | 3–5 |
| France | 2–4 |
| Germany | 2 |
| Greece | 5–7 |
| Hungary | 2–3 |
| Ireland | 4–6 |
| Italy | 3–5 |
| Latvia | 2–3 |
| Lithuania | 1–2 |
| Luxembourg | 2 |
| Malta | 5–7 |
| Netherlands | 2 |
| Poland | 1–2 |
| Portugal | 4–5 |
| Romania | 3–4 |
| Slovakia | 2–3 |
| Slovenia | 2–3 |
| Spain | 4 |
| Sweden | 3–5 |
These times are estimates and are not guaranteed. Delivery may occasionally take a little longer due to customs processing, local conditions, or carrier delays.
Dispatch times
Orders placed before 15:00 CET (Central European Time) on a working day are normally dispatched the same day. Orders placed after 15:00 CET, or on weekends and public holidays, will be dispatched on the next working day.
If you have an urgent order, please email us at info@signalsounds.eu before placing your order and we'll do our best to accommodate you.
Pre-orders
If a product is listed as a pre-order, it means we've ordered it from the supplier but it's not physically in stock yet. The product listing will include an estimated shipping date based on the best information we have from the supplier, but do bear in mind this is subject to change and is not a guaranteed date.
If you place an order containing a mixture of in-stock and pre-order items, we'll normally hold off on shipping anything until the pre-order item(s) have arrived, rather than splitting it into multiple shipments. If you need the in-stock items sooner, we'd recommend placing separate orders. As always, please get in touch at info@signalsounds.eu if you have questions.
Product Overview
TM62100 adds MIDI and additional features to SK15, SK20, SK30 and SK50D synthesizers. It is a direct replacement for the Yamaha YM62100 / YM621 key assigner and can also be used to replace defective original ICs – even when midi is not required. The original behaviour is fully maintained.
TM62100 might also work in organs such as Yamaha D85, please read these notes.
Features:
- MIDI input and output on several channels with optional soft-through
- Independent midi control of upper keyboard, lower keyboard and pedal sections
- Full tonal range in split mode
- Midi filter cutoff and resonance control
- Additional filter LFO
- Midi sustain control
- Midi portamento control
- Midi aftertouch
- Note priority for the pedal/BASS section: Lowest/Last/Highest note
- Built in configuration menu can set midi channels and other parameters.
- Non-destructive installation can be reverted to original
Midi note control
Depending on the synthesizer, the various sound generators can be controlled independently via midi. Typically these are arranged into the same “synth-groups” that exist in the original synthesizers. Each group has its own midi channel configurable using the built in config menu.
- SK15: All sounds on Group 2 *
- SK20: No split mode: Group 1 plays organ, poly-synth and strings. In split mode: Group 1 plays Organ (all 61 notes), Group 2 plays String and Polysynth (All 61 notes)
- SK30: Same as SK20, but SOLO-Synth plays on channel 2 in NORMAL mode and channel 3 in BASS mode.
- SK50D: Group 1 plays the lower keyboard, Group 2 plays the upper keyboard. BASS Plays on Group 3. Depending on settings, SOLO SYNTH plays on Group 2 (NORMAL) or Group 3 (BASS)
* In case of the SK15, it might be possible to re-route the organ section to Group 1 by modifying the circuit. This has not been tested yet.
Additional midi control
If applicable, the following parameters can be controlled additionally:
- Poly-synth filter cutoff (All SK-Synths), with additional LFO
- Poly-synth filter resonance (All SK-Synths) *
- Sustain ON/OFF (SK20, SK30, SK50)
- Solo synth filter cutoff (SK30, SK50) *
- Solo synth Aftertouch (SK30, SK50)
- Solo-synth Portamento ON/OFF (SK30, SK50)
* For the synths with built in SOLO section, it is possible to control Poly-Synth resonance OR Solo-Synth cutoff, but not both. This is a choice you need to make during installation.
Additional Filter LFO
An additional filter LFO is accessible via midi CC controls.
- Frequency range: 0.1 Hz – 1000 Hz
- Free running or midi sync with adjustable divider
- Triangle, Saw, Inverted Saw, Square and Random waveforms
Audio frequency modulation is possible and can create novel sounds usually not possible with the SK-series synths. Warning: At high frequencies, the LFO signal may be audible. This is due to the filter IC suffering from some amount of CV bleed-through.
Midi output
TM62100 features midi output on several midi channels. The various synth-groups (see MIDI input) also apply here. This means the upper, lower and pedal keyboards can send on different midi channels. In split mode the two parts send on different midi channels as well. The channel numbers can be set in the config menu, as well as individual output channels turned off.
MIDI Soft-through
Optionally MIDI soft through can be activated using the config menu. Incoming midi messages will be merged with the internal midi data and forwarded to the MIDI output.
Configuration Menu
The built in configuration menu can be used to set parameters such as midi channels or the pedal note priority. It can be accessed turning the synth on while playing an D-minor chord.
The user manual explains this menu in detail.
Installation
Installation is relatively simple, but requires soldering and drilling holes for the midi sockets.
TM62100 replaces the original YM62100 IC. The original IC needs to be desoldered and a socket put in place. TM62100 is then put in the socket. Holes for the midi sockets need to be drilled and the sockets installed. A stencil for drilling is part of the kit. In order to get additional midi control (e.g. Filter), a few wires need to be soldered to the synthesizer’s PCBs.
Technical Specs
Shipping Details
How much is my shipping?
Shipping costs are calculated automatically at checkout. Simply add items to your cart and proceed to the checkout page, where you'll see the available shipping options and their prices. VAT at the applicable rate for your country will also be displayed at checkout.
European Union orders:
- Standard shipping is free on orders over €100. Express shipping is available on orders over €100, and free on orders over €400.
Poland orders:
- Standard shipping is free on orders over 250 PLN. Express shipping is free on orders over 500 PLN.
What about local taxes?
By default prices on the site include sales tax at 20%. The precise sales tax rate for your country will be calculated at checkout.
Do you ship to my country?
We ship to all EU member states from our warehouse in Warsaw, Poland. Add an item to your cart and enter your country and postcode to see the available shipping options and prices for your location. If you have any questions about shipping to your country, drop us an email at info@signalsounds.eu and we'll be happy to help.
Shipping methods
All EU orders are shipped via UPS. We offer two service levels:
- UPS Standard – our default shipping option. Delivery times vary by country (see estimated delivery times below).
- UPS Express Saver – next business day delivery to most EU destinations.
Each product page shows the estimated delivery time for your location, so you'll always know what to expect before you order.
Estimated delivery times (Standard shipping)
The times below are estimates in working days from dispatch, based on UPS Standard service. Express Saver delivers by the next business day to most destinations.
| Country | Estimated delivery (working days) |
|---|---|
| Austria | 2–3 |
| Belgium | 2 |
| Bulgaria | 4–5 |
| Croatia | 2–4 |
| Cyprus | 10 |
| Czechia | 2–3 |
| Denmark | 3 |
| Estonia | 2–3 |
| Finland | 3–5 |
| France | 2–4 |
| Germany | 2 |
| Greece | 5–7 |
| Hungary | 2–3 |
| Ireland | 4–6 |
| Italy | 3–5 |
| Latvia | 2–3 |
| Lithuania | 1–2 |
| Luxembourg | 2 |
| Malta | 5–7 |
| Netherlands | 2 |
| Poland | 1–2 |
| Portugal | 4–5 |
| Romania | 3–4 |
| Slovakia | 2–3 |
| Slovenia | 2–3 |
| Spain | 4 |
| Sweden | 3–5 |
These times are estimates and are not guaranteed. Delivery may occasionally take a little longer due to customs processing, local conditions, or carrier delays.
Dispatch times
Orders placed before 15:00 CET (Central European Time) on a working day are normally dispatched the same day. Orders placed after 15:00 CET, or on weekends and public holidays, will be dispatched on the next working day.
If you have an urgent order, please email us at info@signalsounds.eu before placing your order and we'll do our best to accommodate you.
Pre-orders
If a product is listed as a pre-order, it means we've ordered it from the supplier but it's not physically in stock yet. The product listing will include an estimated shipping date based on the best information we have from the supplier, but do bear in mind this is subject to change and is not a guaranteed date.
If you place an order containing a mixture of in-stock and pre-order items, we'll normally hold off on shipping anything until the pre-order item(s) have arrived, rather than splitting it into multiple shipments. If you need the in-stock items sooner, we'd recommend placing separate orders. As always, please get in touch at info@signalsounds.eu if you have questions.
