Today i put vems on honda s2000 stroker(2.7l) with sequential gearbox(quaife). Gearbox also has drum sensor.

It's true, firmware was tested with sane drumsensor, and configured properly. Either just proper configuration needed, or maybe firmware-modification for weird drumsensor.

Problem is that gear box has strange outputs (non-monotonous: doesn't rise all the time).

So 1st gear is 0.98V, 2nd 0.37V, 3rd 4.51V, 4th 3.86V,5th 3.31V,6th 2.76V

But look at log, vems has problem with detecting gear.

Engine is off and it's easy to see voltage between gears that can use for shift cut.