The Official Sequential/Oberheim Forum
SEQUENTIAL/DSI => Prophet => Prophet Rev2 => Topic started by: Djerso on January 23, 2024, 04:47:49 PM
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So I have a problem that I don’t understand.
I have an issue when any LFO is affecting the pitch/frequency of my oscillators.
With a triangle-LFO the pitch goes smooth up and down on most keys, but there is one range of keys where the LFO „clicks“ (I.e. it’s not going smooth up & down, it jumps somehow). I even tried to use different LFOs in an initialized pattern. It still does it.
All LFOs jump around the keys A,B(H),C
At G on the bottom of the range and above D the LFOs effect on the pitch is again smooth as expected. It also only happens in this octave and +3 octaves, not others.
This is super annoying because vibratos have the problem that they become clicky robotic on these keys.
It’s such a weird behavior that I can’t make sense of it. Maybe someone of you with more knowledge of the inner working can?
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You seem to have done this in a systematic way still getting issue.
If to take a chance on something I would try a calibration routine on oscillators and filters.
- possibly a global reset first
Described in manual on p69.
You had REV2 for a while and this started to happen, or this is just brand new?
- I assume key sync on lfo and not free running
- I assume oscillators have Note Reset on
From manual
"When the amplifier envelope is set for a fast attack, this can cause a
soft, but detectable, pop or click at the beginning of a note because the
note might be gated on at a point in the wave’s cycle other than a zero
crossing. "
Just some ideas, I will test on my desktop later today if a general issue.
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Tested shortly and see nothing about lfo at all
- just init program and and do lfo1 on alloscillators
- if lfo or note reset is off though you get clicks in between with short attack sometimes
- with higher pitch more often, since more random I guess which phase oscillator is
- but the same without lfo
If I'm doing it wrong just describe how you do it and get your results.
- I'll try to mimic what you do