Again, couple channel aftertouch with sysex. The Sysex string in hexadecimal
to turn this on is as follows:
F0 43 10 4C 08 CC 51 YY F7
Where CC is the Channel from 00 to 0F and YY is the depth of the effect from
00 to 7F.
After you have sent this then you can add channel aftertouch events to add
filter modulation.