sysex formula with checksum problems

[dasfaker]

I’m having troubles with sysex formulas with checksum.

I have this example sysex formula in a modulator: F0 41 10 6a 12 k0 k1 00 30 xx z5 F7. It outputs correctly the checksum value, but it doesn’t react to incoming messages. Only if I replace z5 by the correct checksum value, the modulator accepts the incoming message. So it seems that the checksum algorithm is not working with incoming messages.

I could replace z5 by ii, so incoming messages ignore the checksum byte, and the modulator will accept correctly the incoming messages, but it will not output the correct checksum as there is no way for the mod to know how to calculate checksum (z what?).

[zeoka]

Hi Dasfaker

i had issues on a roland global var + chksm or glb var + ms ls + chksum

Did you try with fixed glb var ?

on old version the cheksum worked (near 1460) in both directions but without any other special bytes in the syx formula

[dasfaker]

Hi Zeoka.

Yes, replacing global variables with fixed variables worked…. but I need global variables and checksum at the same time.

[Author]

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