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 generator.yml

@@ -1,40 +0,0 @@
-name: hihat open
-comment: |
-    Closed hihat: Atk 8 + Dec 60
-    Open hihat: Atk8 + Dec75
-    Shaker: Atk55 + Dec60
-numvoices: 2
-units:
-    - type: envelope
-      id: 1
-      parameters: {attack: 7, decay: 60, gain: 128, release: 0, stereo: 0, sustain: 0}
-    - type: envelope
-      id: 13
-      parameters: {attack: 0, decay: 68, gain: 128, release: 0, stereo: 0, sustain: 0}
-    - type: mulp
-      id: 332
-      parameters: {stereo: 0}
-    - type: noise
-      id: 2
-      parameters: {gain: 63, shape: 52, stereo: 0}
-    - type: mulp
-      id: 15
-      parameters: {stereo: 0}
-    - type: filter
-      id: 12
-      parameters: {bandpass: 0, frequency: 110, highpass: 1, lowpass: 0, negbandpass: 0, neghighpass: 0, resonance: 128, stereo: 0}
-    - type: filter
-      id: 331
-      parameters: {bandpass: 0, frequency: 94, highpass: 0, lowpass: 0, negbandpass: 1, neghighpass: 0, resonance: 128, stereo: 0}
-    - type: pan
-      id: 5
-      parameters: {panning: 64, stereo: 0}
-    - type: outaux
-      id: 6
-      parameters: {auxgain: 0, outgain: 59, stereo: 1}
-    - type: noise
-      id: 10
-      parameters: {gain: 31, shape: 50, stereo: 0}
-    - type: send
-      id: 11
-      parameters: {amount: 51, port: 0, sendpop: 1, stereo: 0, target: 12, unit: 0, voice: 0}