[ot][spam][random][crazy][random][crazy]

[Undescribed Horrific Abuse, One Victim & Survivor of Many]

ok the idxs are wrong
recording idx 0 <==> waveform idx 0
recording idx 1 <==> waveform idx (1.0,3.0)
...
recording idx N <==> waveform idx 4+(2.0,5.0)

the wave is [0,1,2,3]
the recording would be [0,2,1,3] with indices slowly shifting and modulo so like
[0,2,5,7]

this seems to happen with np.linspace(0,N*2-1,N,endpoint=True)
just found by trial