* Pinout
** Keyboard.
| Header | Arduino | Name | Function | Color  |
|--------+---------+------+----------+--------|
|      1 | A0      | KD1  | S1       |        |
|      2 | A1      | KD2  | S1       |        |
|      3 | A2      | KD3  | S1       |        |
|      4 | A3      | KD4  | S1       |        |
|      5 | A4      | KD5  | S2       | Red    |
|      6 | A5      | KD6  | S2       | Grey   |
|      7 | D2      | KD7  | S2       | Yellow |
|      8 | D3      | KD8  | S2       | Purple |
|      9 | D4      | SA1  | Select A | White  |
|     10 | D5      | SA2  | Select B | Black  |
|     11 | D6      | SA3  | Select C | Blue   |
|     12 | D7      | SA4  | Mult 1   | Orange |
|     13 | D8      | SA5  | Mult 2   | Black  |
|     14 | 5V      | 5V   |          | White  |
|     15 | GND     | GND  |          | Yellow |

See [[file:resources/KSP10, KSP20, KSP30.pdf][service manual]].
#+DOWNLOADED: screenshot @ 2021-08-14 10:28:26
[[file:Pinout/2021-08-14_10-28-26_screenshot.png]]

#+DOWNLOADED: screenshot @ 2021-08-14 10:28:49
[[file:Pinout/2021-08-14_10-28-49_screenshot.png]]
*** Mulitplexer

#+DOWNLOADED: screenshot @ 2021-08-14 10:29:29
[[file:Pinout/2021-08-14_10-29-29_screenshot.png]]


#+DOWNLOADED: screenshot @ 2021-08-14 10:29:44
[[file:Pinout/2021-08-14_10-29-44_screenshot.png]]

See [[file:resources/multiplexer.pdf][pdf]].
** Pedals
With $2k\Omega$ resistors.
| Header | Arduino | Name | Function | Color          |
|--------+---------+------+----------+----------------|
|      2 | GND     | GND  |          | Brown          |
|      4 | D9      | SSTE | Sustain  | Violet and Red |


#+DOWNLOADED: screenshot @ 2021-08-14 10:27:48
[[file:Pinout/2021-08-14_10-27-48_screenshot.png]]