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@@ -1,4 +1,5 @@
 * Pinout
+** Keyboard.
 | Header | Arduino | Name | Function | Color  |
 |--------+---------+------+----------+--------|
 |      1 | A0      | KD1  | S1       |        |
@@ -16,3 +17,30 @@
 |     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]]

resources/multiplexer.pdf

@@ -0,0 +1,36 @@
+--2021-08-14 10:30:55--  https://www.ti.com/lit/ds/symlink/sn74ls138.pdf
+Resolving www.ti.com (www.ti.com)... 23.63.112.239, 2a02:26f0:300:194::b48, 2a02:26f0:300:1a3::b48
+Connecting to www.ti.com (www.ti.com)|23.63.112.239|:443... connected.
+HTTP request sent, awaiting response... 200 OK
+Length: 1315129 (1.3M) [application/pdf]
+Saving to: ‘sn74ls138.pdf’
+
+     0K .......... .......... .......... .......... ..........  3%  762K 2s
+    50K .......... .......... .......... .......... ..........  7% 2.82M 1s
+   100K .......... .......... .......... .......... .......... 11% 3.87M 1s
+   150K .......... .......... .......... .......... .......... 15% 4.53M 1s
+   200K .......... .......... .......... .......... .......... 19% 5.04M 0s
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+   800K .......... .......... .......... .......... .......... 66% 10.4M 0s
+   850K .......... .......... .......... .......... .......... 70% 14.4M 0s
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+  1050K .......... .......... .......... .......... .......... 85% 11.0M 0s
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+  1150K .......... .......... .......... .......... .......... 93% 14.3M 0s
+  1200K .......... .......... .......... .......... .......... 97% 10.5M 0s
+  1250K .......... .......... .......... ....                 100% 27.7M=0.2s
+
+2021-08-14 10:31:03 (6.22 MB/s) - ‘sn74ls138.pdf’ saved [1315129/1315129]
+