Mechanism is split between the YAML and the SFZ file and works as follows:
Bass Drum 1:
Bass Drum volume:
midi_cc: 16
value: 127
Bass Drum pan:
midi_cc: 17
value: 64
Bass Drum 2:
Bass Drum type:
midi_cc: 18
value: 0
graph_path: 'note_on'
labels: ['Clean', 'Color 01', 'Color 02', 'Color 03', 'Color 04', 'Color 05', 'Tape', 'Tube']
ticks: [0, 16, 32, 48, 64, 80, 96, 112]
Bass Drum decay:
midi_cc: 19
value: 0
graph_path: 'note_on'
labels: ['Decay Short', 'Decay Medium', 'Decay Long']
ticks: [0, 43, 86]
Bass Drum tone:
midi_cc: 20
value: 0
graph_path: 'note_on'
labels: ['Tone A', 'Tone B', 'Tone C', 'Tone D', 'Tone E', 'Tone F']
ticks: [0, 22, 44, 65, 86, 107]
Bass Drum tune:
midi_cc: 21
value: 64
…and then the corresponding part in the SFZ:
#define $BASS_DRUM_NOTE 36
set_cc16=127 // Bass Drum Volume
set_cc17=64 // Bass Drum Pan
set_cc18=0 // Bass Drum Type
set_cc19=0 // Bass Drum Decay
set_cc20=0 // Bass Drum Tone
set_cc21=64 // Bass Drum Tune
<master>
key=$BASS_DRUM_NOTE
amp_veltrack=100
pitch_keycenter=$BASS_DRUM_NOTE
volume=-30
volume_cc16=36
volume_curvecc16=20
pan=-100
pan_oncc17=200
<group> // Bass Drum - Clean (Type mode)
locc18=0
hicc18=15
<region> sample=TR-909/01._Bass_Drum/01._Clean/01._Short/BD_909_Clean_Short_A_01.wav locc19=0 hicc19=42 locc20=0 hicc20=21 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/01._Short/BD_909_Clean_Short_A_06.wav locc19=0 hicc19=42 locc20=0 hicc20=21 locc21=107 hicc21=127
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/01._Short/BD_909_Clean_Short_B_06.wav locc19=0 hicc19=42 locc20=22 hicc20=43 locc21=107 hicc21=127
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/01._Short/BD_909_Clean_Short_C_06.wav locc19=0 hicc19=42 locc20=44 hicc20=64 locc21=107 hicc21=127
<region> sample=TR-909/01._Bass_Drum/01._Clean/01._Short/BD_909_Clean_Short_D_01.wav locc19=0 hicc19=42 locc20=65 hicc20=85 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/01._Short/BD_909_Clean_Short_D_06.wav locc19=0 hicc19=42 locc20=65 hicc20=85 locc21=107 hicc21=127
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/01._Short/BD_909_Clean_Short_E_06.wav locc19=0 hicc19=42 locc20=86 hicc20=106 locc21=107 hicc21=127
<region> sample=TR-909/01._Bass_Drum/01._Clean/01._Short/BD_909_Clean_Short_F_01.wav locc19=0 hicc19=42 locc20=107 hicc20=127 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/01._Short/BD_909_Clean_Short_F_06.wav locc19=0 hicc19=42 locc20=107 hicc20=127 locc21=107 hicc21=127
<region> sample=TR-909/01._Bass_Drum/01._Clean/02._Medium/BD_909_Clean_Medium_A_01.wav locc19=43 hicc19=85 locc20=0 hicc20=21 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/02._Medium/BD_909_Clean_Medium_A_06.wav locc19=43 hicc19=85 locc20=0 hicc20=21 locc21=107 hicc21=127
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/02._Medium/BD_909_Clean_Medium_B_06.wav locc19=43 hicc19=85 locc20=22 hicc20=43 locc21=107 hicc21=127
<region> sample=TR-909/01._Bass_Drum/01._Clean/02._Medium/BD_909_Clean_Medium_C_01.wav locc19=43 hicc19=85 locc20=44 hicc20=64 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/02._Medium/BD_909_Clean_Medium_C_06.wav locc19=43 hicc19=85 locc20=44 hicc20=64 locc21=107 hicc21=127
<region> sample=TR-909/01._Bass_Drum/01._Clean/02._Medium/BD_909_Clean_Medium_D_01.wav locc19=43 hicc19=85 locc20=65 hicc20=85 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/02._Medium/BD_909_Clean_Medium_D_06.wav locc19=43 hicc19=85 locc20=65 hicc20=85 locc21=107 hicc21=127
<region> sample=TR-909/01._Bass_Drum/01._Clean/02._Medium/BD_909_Clean_Medium_E_01.wav locc19=43 hicc19=85 locc20=86 hicc20=106 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/02._Medium/BD_909_Clean_Medium_E_06.wav locc19=43 hicc19=85 locc20=86 hicc20=106 locc21=107 hicc21=127
<region> sample=TR-909/01._Bass_Drum/01._Clean/02._Medium/BD_909_Clean_Medium_F_01.wav locc19=43 hicc19=85 locc20=107 hicc20=127 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/02._Medium/BD_909_Clean_Medium_F_06.wav locc19=43 hicc19=85 locc20=107 hicc20=127 locc21=107 hicc21=127
<region> sample=TR-909/01._Bass_Drum/01._Clean/03._Long/BD_909_Clean_Long_A_01.wav locc19=86 hicc19=127 locc20=0 hicc20=21 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/03._Long/BD_909_Clean_Long_A_06.wav locc19=86 hicc19=127 locc20=0 hicc20=21 locc21=107 hicc21=127
<region> sample=TR-909/01._Bass_Drum/01._Clean/03._Long/BD_909_Clean_Long_B_01.wav locc19=86 hicc19=127 locc20=22 hicc20=43 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/03._Long/BD_909_Clean_Long_B_06.wav locc19=86 hicc19=127 locc20=22 hicc20=43 locc21=107 hicc21=127
<region> sample=TR-909/01._Bass_Drum/01._Clean/03._Long/BD_909_Clean_Long_C_01.wav locc19=86 hicc19=127 locc20=44 hicc20=64 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/03._Long/BD_909_Clean_Long_C_06.wav locc19=86 hicc19=127 locc20=44 hicc20=64 locc21=107 hicc21=127
<region> sample=TR-909/01._Bass_Drum/01._Clean/03._Long/BD_909_Clean_Long_D_01.wav locc19=86 hicc19=127 locc20=65 hicc20=85 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/03._Long/BD_909_Clean_Long_D_06.wav locc19=86 hicc19=127 locc20=65 hicc20=85 locc21=107 hicc21=127
<region> sample=TR-909/01._Bass_Drum/01._Clean/03._Long/BD_909_Clean_Long_E_01.wav locc19=86 hicc19=127 locc20=86 hicc20=106 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/03._Long/BD_909_Clean_Long_E_06.wav locc19=86 hicc19=127 locc20=86 hicc20=106 locc21=107 hicc21=127
<region> sample=TR-909/01._Bass_Drum/01._Clean/03._Long/BD_909_Clean_Long_F_01.wav locc19=86 hicc19=127 locc20=107 hicc20=127 locc21=0 hicc21=21
..
<region> sample=TR-909/01._Bass_Drum/01._Clean/03._Long/BD_909_Clean_Long_F_06.wav locc19=86 hicc19=127 locc20=107 hicc20=127 locc21=107 hicc21=127
<group> // Bass Drum - Color 01 (Type mode)
locc18=16
hicc18=31
<region> sample=TR-909/01._Bass_Drum/04._Color/Color_01/01._Short/BD_909_Color_01_Short_A_01.wav locc19=0 hicc19=42 locc20=0 hicc20=21 locc21=0 hicc21=21
<region> sample=TR-909/01._Bass_Drum/04._Color/Color_01/01._Short/BD_909_Color_01_Short_A_02.wav locc19=0 hicc19=42 locc20=0 hicc20=21 locc21=22 hicc21=43
<region> sample=TR-909/01._Bass_Drum/04._Color/Color_01/01._Short/BD_909_Color_01_Short_A_03.wav locc19=0 hicc19=42 locc20=0 hicc20=21 locc21=44 hicc21=64
<region> sample=TR-909/01._Bass_Drum/04._Color/Color_01/01._Short/BD_909_Color_01_Short_A_04.wav locc19=0 hicc19=42 locc20=0 hicc20=21 locc21=65 hicc21=85
<region> sample=TR-909/01._Bass_Drum/04._Color/Color_01/01._Short/BD_909_Color_01_Short_A_05.wav locc19=0 hicc19=42 locc20=0 hicc20=21 locc21=86 hicc21=106
<region> sample=TR-909/01._Bass_Drum/04._Color/Color_01/01._Short/BD_909_Color_01_Short_A_06.wav locc19=0 hicc19=42 locc20=0 hicc20=21 locc21=107 hicc21=127
.....
Here it is in a “single bass drum” form: using CCs I can control volume, pan, color, decay, tone type, and tuning of the drum.