feat(tracker/presets): new and tweaked presets from Reaby

The presets are also organized by their type into subfolders.

Closes #136

tracker/presets/DR/DiscoTom.yml

@@ -0,0 +1,26 @@
+name: DiscoTom
+numvoices: 2
+units:
+    - type: envelope
+      id: 1
+      parameters: {attack: 37, decay: 96, gain: 64, release: 46, stereo: 1, sustain: 46}
+    - type: oscillator
+      id: 2
+      parameters: {color: 58, detune: 66, gain: 100, looplength: 104, loopstart: 831, phase: 0, samplestart: 1543725, shape: 57, stereo: 1, transpose: 64, type: 4, unison: 1}
+    - type: mulp
+      id: 3
+      parameters: {stereo: 1}
+    - type: pan
+      id: 5
+      parameters: {damp: 0, dry: 128, feedback: 96, notetracking: 2, panning: 63, pregain: 40, stereo: 1}
+    - type: outaux
+      id: 6
+      parameters: {auxgain: 7, outgain: 67, panning: 64, stereo: 1}
+    - id: 12
+      parameters: {}
+    - type: envelope
+      id: 10
+      parameters: {attack: 37, auxgain: 64, decay: 81, gain: 80, outgain: 64, release: 54, stereo: 0, sustain: 16}
+    - type: send
+      id: 11
+      parameters: {amount: 84, port: 0, sendpop: 1, stereo: 0, target: 2, unit: 0, voice: 0}