Prophet Rev2 - Note Number Modulation Lookup TableBelow is a lookup table for important values associated with using Note Number as a source in the modulation matrix. Note Num modulation can achieve many desirable and advanced effects, but you have to be ready to do some math if you want a good understanding and control over it.
Important Notes About the Table:The "Value Per Key" and "61-key Range" are the two fields that you're probably going to want to start from. If you know you want the output to be a specific amount per key, then reference "value per key". If you know the total value range you want from the lowest key on the keyboard to the highest, then reference the 61-key-range as your starting point to get the Note Num amount that you should use.
Next, check the First Key Offset. Since MIDI Notes/Keys start at MIDI Note #0 (C-1), the Note Number Modulation starts there... and there's 36 sub and low bass notes before you get to the first key on the Prophet Rev2 keyboard (in standard octave range). If you're okay with the first physical key on the board having that First Key Value, then you're good to go.
But you may want the first key to start at '0' output value in many cases. If you want this behavior, you need to offset the value of your target by a negative amount (-) equal to the First Key Offset. For instance, if you're targeting an Osc Mix Level that you want to increase over the keybed, and the First Key Offset for your Note Modulation Output is +9, then you may want to use another mod slot to cancel out the first key offset:
Source: Note Num
Dest: Osc Mix
Amount: 32 (gives an output of 9 at first key... Midi Note#36)
Source: DC
Dest: Osc Mix
Amount: -9
Utilization1. Controlling Bass vs Mid vs High range effects
There are various different cases where it's advantageous to treat lower notes differently than higher notes. If I'm setting up PWM/Shape Mod LFOs, I often want the bass PWM be less pronounced (it gets flubby otherwise). If I'm setting up performance modulation with Pressure or Mod Wheel affecting cutoff, lfo vibrato, or various other effects, I'll often setup Note Num modulation to make the effects less pronounced on bass notes... it can give more clarity and definition.
2. Controlling Tuning and Intonation, Fine Tune Control over Cutoff
You can use low amounts of Note Num modulation routed to Osc Frequency to mimic intonation / tuning offsets... squashing or stretching tuning. There are many advanced topics related to this which I may go into later, but there's a lot of interesting territory to be explored by Note Num modulation with Frequency, fine tuning via Voice Modeling / Gated Sequencer scaling, and playing with cross modulation between LFOs. Also, you can get fine tune control over cutoff. Two interesting data points above: 256 is the value needed to route via Note Num to Osc Freq to replicate the Osc Key Tracking Switch (ie: if you turn off osc key track and setup three note num mod slots with 256 total value to osc freq, you get the same effect) Also, 128 is the value needed to route to Cutoff to be equivalent to setting Key Amount to 64.
3. Osc Mixing, Shape Mod, Other Mix Levels over the Keybed
You can setup various destination to have a perfect swing from 0 to Max Value, starting at the first physical key and ending at the last (or even more compressed in some cases) You may need to use up a bunch of mod slots, but it can be done. I posted this example of swinging Osc Mix from 0-128 over the keyboard:
Source: Note Num
Dest: Osc Mix
Amount: 127
Source: Note Num
Dest: Osc Mix
Amount: 127
Source: Note Num
Dest: Osc Mix
Amount: 19
= Total of 273 Note Num Modulation gives output of 127.97 over 61-key range
Source: DC
Dest: Osc Mix
Amount: -77
The DC offsets the First Key Amount of 76.78 down to about 0, so the first physical key starts at 0 mix, and the last physical key is right about 128.
There are many other advanced modulation techniques related to Note Num Modulation. Making this table has helped me out on many occasions... Hopefully you guys will find it a helpful reference.
- Jason
I'm gonna release some videos soon with more examples of Note Num modulation in patch editing.