feat!: display the parameters as knobs in a grid

Also removed the negbandpass & neghighpass parameters
and replaced them with bandpass & highpass set to -1, to
fit the switches better to the GUI.

Closes #51, closes #173

tracker/presets/DR/hihat-open-sample.yml

@@ -0,0 +1,18 @@
+name: hihat-open-sample
+numvoices: 1
+units:
+    - type: envelope
+      id: 1044
+      parameters: {attack: 0, decay: 80, gain: 121, release: 0, stereo: 0, sustain: 0}
+    - type: oscillator
+      id: 1045
+      parameters: {color: 64, detune: 64, gain: 95, looplength: 3761, loopstart: 5808, phase: 0, samplestart: 867145, shape: 74, stereo: 0, transpose: 88, type: 4}
+    - type: mulp
+      id: 1046
+      parameters: {stereo: 0}
+    - type: pan
+      id: 1048
+      parameters: {panning: 64, stereo: 0}
+    - type: outaux
+      id: 1049
+      parameters: {auxgain: 0, outgain: 93, stereo: 1}