Hi Sasa, It looks like you have your waveform sequences set up correctly: 0x04 = 0x01; 0x05-0x07 = 0xA0; 0x08 = 0x01. You are using the external TRIG edge mode, so to start the waveform, are you playing a single pulse on the TRIG pin? On your scope shot is that just OUT+? Is it possible to see OUT+/- and the TRIG pin? My suggestion for debugging is to just play a single waveform and make sure you can play the different waveforms in the library like ramps and long alerts/buzzes. Once the single waveform looks good, try doing 2 in sequence and build up to the final full sequence.
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