Sequencer mode, sampling tab, upper right arrow menu, auto-sampling options - select In-track sampling,
set desired options for audio source, fielding, which track is supposed to uphold the control data, program slot where .ksf will be assigned to oscillator (because technically control data tells sequencer where to play program with sampled material);
press OK,
set the trigger:
1. if you want your song to go on and you start sampling in certain time, select Sampling START SW, then press sampling REC and sequencer start/stop, when time point is reached press sampling START and sample.
2. If you want sequencer start/stop to trigger sampling, select it, press sampling REC and start, after that press sequencer start/stop and sample.
etc with options
Voila. That's it.
Now, this part:
The parameter/ops guides are of little help, as they don't give a direct answer.
is what confuses me.
I learned how to sample in-track by reading the parameter guide.
Works fine for me.
Pages 64, 65 and 66 in Parameter Guide are your friends in this matter.