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 (sample).yml

@@ -1,18 +0,0 @@
-name: hihat (sample)
-numvoices: 1
-units:
-    - type: envelope
-      id: 1078
-      parameters: {attack: 0, decay: 65, gain: 128, release: 0, stereo: 0, sustain: 0}
-    - type: oscillator
-      id: 1079
-      parameters: {color: 57, detune: 64, gain: 128, looplength: 1, loopstart: 1343, phase: 0, samplestart: 367477, shape: 82, stereo: 0, transpose: 70, type: 4}
-    - type: mulp
-      id: 1080
-      parameters: {stereo: 0}
-    - type: pan
-      id: 1081
-      parameters: {panning: 62, stereo: 0}
-    - type: outaux
-      id: 11
-      parameters: {auxgain: 0, outgain: 65, stereo: 1}