As for the scale change NRPN, it is a convention I came up with but haven't spread the word about yet, currently only the experimental app KeyIn supports it.
Here is a description of the spec for completeness, although I doubt you can use this as is, it probably needs some coding to take advantage of it in practice.
Using NRPN # 72 (MSB) ,53 (LSB) to change the playable notes:
Code: Select all
CC 99 72
CC 98 53
CC 6 hi_7bits
CC 38 low_7bits
Where the value of the bits are a mask where the 0th bit is a C and the 11th bit is B, the remaining bits will always be 0 value.
For example a C major scale (all white keys) would look this in binary (the least significant 0th bit is on the right, a C):
Code: Select all
HI byte Low byte
notes: xxBxAxG xFExDxC
binary: 0010101 0110101
decimal: 21 53
hex: 0x15 0x35
I was planning on letting other developers know about this convention sometime, and I may extend it to another NRPN that does intervals in a scale along with key, as an alternative.
Right now TJ only listens for it, but for completeness I need to add send as well.
