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kick drums synthesis

 
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earle



Joined: 10 Oct 2007
Posts: 3

PostPosted: Mon Dec 01, 2008 5:49 pm    Post subject: kick drums synthesis Reply with quote

Hi,
I'm trying to make a 909 kick patch that can be pitched, the one in the presets (in the tutorial section) can't be.
can any one help me with this, its doing my head in?

also can anyone please explain what what generates the sound in this preset (or the other kick presets for that matter) as both oscilators are off?
I've tried to deconstruct the patch but to no avail!
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cnse



Joined: 01 Mar 2004
Posts: 25

PostPosted: Wed Jan 21, 2009 4:09 am    Post subject: 909 kk patch explanation Reply with quote

I haven't listened to the patch in question, but I think I can offer a good explanation. Anyone please feel free to correct or clarify my answer.

My guess is that the sound is coming from the filter, whose resonance is cranked into self oscillation. (remember, resonance=a boost at the cutoff frequency. Try to find an X,Y plot of some common filter type inputs/outputs if this is unfamiliar). The property of self resonance (oscillating at the cutoff frequency) is an artifact of imperfections in analog filter design, and is often emulated in digital models in softsynths.

The filter envelope is controlling the pitch of the filter, and thus, of the self oscillation. It probably has near 0 attack, and a reasonably long decay (bweeeeooowwwww)(that's my phonetic approximation of the sound).

If the filter tracking is set at %100 (so that the filter frequency rises and falls in a manner directly proportional to the incoming note number (and frequency of the oscillators), I'd think you should be able to get a pitchable KK sound.

So, check the tracking, and see what it's set at.
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daniel.b



Joined: 13 Dec 2007
Posts: 22
Location: Germany

PostPosted: Wed Mar 04, 2009 6:34 pm    Post subject: Re: 909 kk patch explanation Reply with quote

cnse wrote:
If the filter tracking is set at %100 (so that the filter frequency rises and falls in a manner directly proportional to the incoming note number (and frequency of the oscillators), I'd think you should be able to get a pitchable KK sound.

So, check the tracking, and see what it's set at.

Yes you get tracking, but it doesn't sound right over the complete keyboard range.

If you connect >> Midi Note CV (out) >> Attenuator1 (in) >> Attenuator1 1/8 (out) >> VCF CV (in) you get a full playable filtersound.

Note: If you want that it sound in-tune to your other sounds, you must tune the filter to the oscillators. 329,6hz or an octave lower 164,8hz.
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