Controlling the Hydrasynth with MAX8 via MIDI-NRPN

Ok , it looks as following.

NRPN message is formed using 4 CC messages

1 & 2 are parameter number, 3 & 4 are values, both MSB LSB

4 CC numbers are 99 98 6 38

as we send raw midi, one has to prepend status bytes which for CC messages

range from 176 ~ 191 for midi channels 1 ~ 16.

you will need to convert parameter number and values from HEX to decimal.

then form MSB LSB parameter and 2 values, for example OSC Mode :

3FH 18H hex = 63 24 decimal (H makes sure that we understand it as Hex number)

176 99 63 176 98 24 176 6 nn 176 38 nn

176 99 63 = MSB parameter (that stupid description VV)

176 98 24 = LSB parameter (that stupid description WW)

176 6 nn = MSB value 0, 1, 2 to target OSC1, OSC2 or OSC3

176 38 nn = LSB value which in this case selects mode , 0 = single, 1 = WaveScan.

For example to set OSC1 to WaveScan using midi channel 1

176 99 63 176 98 24 176 6 0 176 38 1 as raw midi message

to set OSC2 to Single

176 99 63 176 98 24 176 6 1 176 38 0

or you do it like this :

...................................

for NRPN values which use hires you need to create MSB LSB

let's take OSC1 Type

it says 3FH 19H = dec 63 25, value range 0 ~218

176 99 63 176 98 25 176 6 nn 176 38 nn

in max 0 ~ 16383 (14 bit value) to MSB LSB :

in this case you keep value to max 218, I don't know what you synth would do if you send

out of range controls.

to convert Hex to decimal pairs, use sprintf 0x%s 0x%s

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I hope this helps you