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/PL/Brass.yml

@@ -1,7 +1,10 @@
-name: Brass
+name: brass
 comment: Brass sound use for short stabs at C1-C2 range
-numvoices: 4
+numvoices: 1
 units:
+    - id: 225
+      parameters: {}
+      comment: Main envelopes
     - type: envelope
       id: 163
       parameters: {attack: 24, decay: 128, gain: 59, release: 89, stereo: 0, sustain: 128}
@@ -11,6 +14,9 @@ units:
     - type: mulp
       id: 216
       parameters: {stereo: 0}
+    - id: 226
+      parameters: {}
+      comment: Main oscillators
     - type: oscillator
       id: 164
       parameters: {color: 40, detune: 64, gain: 128, lfo: 0, phase: 68, shape: 88, stereo: 0, transpose: 64, type: 1, unison: 3}
@@ -29,27 +35,33 @@ units:
     - type: mulp
       id: 167
       parameters: {stereo: 0}
+    - id: 227
+      parameters: {}
+      comment: Effects & output
     - type: compressor
+      id: 222
       parameters: {attack: 14, invgain: 97, ratio: 38, release: 61, stereo: 0, threshold: 27}
     - type: mulp
-      id: 222
+      id: 223
       parameters: {stereo: 0}
     - type: filter
       id: 217
-      parameters: {bandpass: 1, frequency: 57, highpass: 1, lowpass: 1, negbandpass: 0, neghighpass: 0, resonance: 26, stereo: 0}
+      parameters: {bandpass: 1, frequency: 57, highpass: 1, lowpass: 1, resonance: 26, stereo: 0}
     - type: filter
       id: 218
-      parameters: {bandpass: 1, frequency: 85, highpass: 0, lowpass: 0, negbandpass: 0, neghighpass: 1, resonance: 33, stereo: 0}
+      parameters: {bandpass: 1, frequency: 85, highpass: -1, lowpass: 0, resonance: 33, stereo: 0}
     - type: pan
       id: 168
       parameters: {panning: 61, stereo: 0}
     - type: outaux
       id: 172
       parameters: {auxgain: 31, outgain: 67, stereo: 1}
-    - parameters: {}
+    - id: 224
+      parameters: {}
+      comment: Filter modulation
     - type: loadnote
       id: 219
       parameters: {stereo: 0}
     - type: send
       id: 220
-      parameters: {amount: 89, port: 0, sendpop: 1, stereo: 0, target: 218, unit: 0, voice: 0}
+      parameters: {amount: 89, port: 0, sendpop: 1, stereo: 0, target: 218, voice: 0}