Not sure how it works, but I accidentally clicked "+" on LoopEnd and that fixed the problem! Looks like Sampler counts sample length differently or something.

My loop end point is exactly at the end of the sample so I shouldn't be able to increase LoopEnd position by clicking "+", but all samples have +1 "gap" at the end of the sample.

And if the loop region is in the middle of the sample, then "+1" or "-1" on LoopEnd or LoopStart fixes the problem.

Maybe this will be useful for someone :)

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@DabDab I'm using MIDI scripts like these

https://forum.hise.audio/topic/1122/midi-transpose-cents/2

https://forum.hise.audio/topic/2714/adjust-semitones-frontpanel/9

And there is built-in Transpose MIDI script in HISE

@Christoph-Hart ahhh, thanks! 8 should be enough.

@d-healey Well, that was easy. Thanks a lot for your help! This is my first experience with development.

For some reason it only compiled VST, but at least it works :)

@d-healey Thanks! I'm going to watch all your videos some day, they're very helpful!

@lalalandsynth You can't modulate sample start with Wavetable. So if you want to use unison + detune (like in a regular synth) to make some typical synth lead it will sound kinda weird, with some flanger effect.