Help me better understand HD-1 modulations

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OboKeyDrum
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Joined: Mon Apr 04, 2011 8:35 pm

Help me better understand HD-1 modulations

Post by OboKeyDrum »

I have a question towards program "New North Wind" (INT-F 052 in Kronos 1):

This program generates a wind sound with a rising pitch over ca. 5 seconds. Sometimes, the pitch rises very high, sometimes just a little, i.e. the maximum pitch varies between two key trigger events.

My goal is to have a predictable rise of the pitch, preferable going up very high. Bonus points if I can adjust how long it takes to reach the maximum pitch. :-)

Failed solution approaches:
  • At first, I thought it had something to do with an LFO not being in sync with the keys, so I enabled this option for LFO2 where it had previously been disabled. For LFO1, this option was already enabled, the common LFO does not have this option.

    Then, I tried changing the shape of LFO2 (which was random before, so I thought this was the problem).

    Finally, I made sure, that the key trigger events all had the some velocity using the keypads with fixed velocity.
Unfortunately, non of the approaches worked. Maybe you have an idea?
coyote144
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Post by coyote144 »

I have checked this program. It is not really the pitch which is changed by LFO, but Filter Cutoff and its resonance. LFO1, LFO2 and Common LFO change cutoff and the resonance of filter 1, either directly or with AMS Mixer 2.

Go to filter modulation tab to put intensities to zero. In filter main page also there is a resonance modulation that can be cancelled.

The difference in "pitches" is not related to key event. One of de LFO is a random one, it is normal that it does not behave in a cycled way.

Try to change LFO to a rising saw shape. Select "stop" command in the LFO menu, in order to make the LFO do a single cycle before being frozen. LFO speed is the way to change the rise speed. You can setup the LFO in MIDI sync, then you will be able to choose a note value to control its rise length.
OboKeyDrum
Posts: 23
Joined: Mon Apr 04, 2011 8:35 pm

Post by OboKeyDrum »

Thank you for the tip with the filter modulation!

I ended up turning off AMS Mixer 1 for LFO 1 and increasing the intensity of LFO 1 to Filter A. That was sufficient to have a predictable pitch rising.
coyote144
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Post by coyote144 »

You are welcome :wink:
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