#CC88 which act as an HRVP isn´t one 14bit #CC !
It is in fact only one 7Bit LSB prefix CC to the 7 bit Note ON & Note Off VV
(which are both not Controller Message Values)
So it isnt in fact one 14bit "CC"
It is one 7 bit CC and one 7 bit vv Note ON or true OFF event, but not two CCs ^^
And principle ; within a SEQ.and for HRVP support
nothing is specially needed.
(exept that the HRVP should, of course, move with the Note ON/Off event.
And that is already one per option behavior which is easy possible within REAPER
Note ON|64|0 would always be Note Off
#CC88 CHn v0 = Ignore/Off
HRVP n|0;Note ON n|NN 64|VV 64 =Velo 64
HRVP n|1;Note On n|NN 64|VV 64 =Velo ~64.0079
HRVP n|1;Note On n|NN 64|VV 64 =Velo ~64.0158
HRVP n|2;Note On n|NN 64|VV 64 =Velo ~64.0237
HRVP n|100;Note On n|NN 64|VV 64 =Velo ~64.79
HRVP n|78;Note Off n|NN 64|VV 64 =Note Off Velo ~64.6162
HRVP n|2;Note On n|NN 110|VV 64 =Velo ~110.0237
CC88 for HRVP is only one Controller;the same as all other Controller
And as all other Controller, you could example assign HRVP(88) to VolumePedals
and get LSB (inbetween) steps- if your Master-K do not support HRVP by native