How do you make Crack modulation and filter mod LFO?

    May 03 2006 | 5:19 pm
    Hi, Im trying to build a drum synth in maxmsp and trying to copy the diagram from the Waldorf Attack manual which states that i have to use Crack Modulation and a Filter mod LFO. I have sussed out the rest i think, but im not sure what these two parts are. Would anyone know how to recreate these in maxmsp?

    • May 03 2006 | 6:22 pm
      The filter mod LFO is just a low frequency oscillator modulating a (presumably lowpass) filter.
      Now "crack" modulation must refer to the sound produced in oldskool drum-machine claps? In any case the crack is often just a series of downwards going ramps, which can be emulated with a multi-breakpoint envelope - draw in a regular fast attack, semi-long release envelope and then draw teeth on it :)
    • May 03 2006 | 7:09 pm
      Or you could do it with a combination of two phasor~s and a sah~.
      Here's an example.
      Peter McCulloch
    • May 03 2006 | 8:53 pm
      Okay, i have done the method first suggested and it seems to work pretty well. I can imagine this is how they make a clap sound. As for the second description i dont really know what all the numbers mean, or how to apply them in a patch. Would you also give me an example of how to modulate a filter with an LFO?
      Thanks in advance
    • May 04 2006 | 2:07 am
      in max/msp the center/cutoff frequency for filters can sometimes (usually) be modulated by a signal. use the oscillator of your choice to continually vary the center/cutoff freq. of the filter. there is a tutorial patch that shows you how to do frequency modulation and amplitude modulation for synthesizers. apply this method to a filter.