Hi, I bought my OP1 from an individual. I immediately took to sampling and I noticed that when I did the synth sampler the waveform screen would shake when I played the sample with a key stroke. I also was having trouble getting the sample to play from the beginning, it would play from a couple milliseconds in. Still I didnt think it was that big of a deal until I sampled one note on a guitar and reversed the sample and when I would play it the end of the sample, which was the original beginning since I reversed it, would cut out towards the end in like a stuttering way. Its kind of hard to explain, but its almost like a noise gate is applied to it or something. However it make me think that this is related to the waveform screen shaking when I play it. I would really like to see if I can fix this or if there are any solutions because I really like the idea of the synth sampler.
I guess you have an LFO activated. In Synth mode, just press 4 under the display twice & it should be fixed.