How do you make Crack modulation and filter mod LFO?

May 3, 2006 at 5:19pm

How do you make Crack modulation and filter mod LFO?

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?

Cheers

Alice

#25767
May 3, 2006 at 6:22pm

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 :)

Andreas

#76263
May 3, 2006 at 7:09pm

Or you could do it with a combination of two phasor~s and a sah~.

Here’s an example.

Peter McCulloch

#P window setfont “Sans Serif” 9.;
#P window linecount 1;
#P comment 208 55 108 196617 Speed of overall ratio;
#P comment 320 196 67 196617 Size of teeth;
#P user ezdac~ 31 81 75 114 0;
#P user scope~ 166 319 296 449 256 3 128 0. 1. 0 0. 0 0. 102 255 51 135
135 135 0;
#P newex 166 78 34 196617 * -1.;
#P flonum 166 53 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P newex 166 291 27 196617 +~;
#P flonum 236 108 35 9 0. 0 1 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P flonum 281 195 35 9 0. 1. 3 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P newex 197 221 30 196617 !- 1.;
#P newex 250 246 41 196617 *~ 0.2;
#P newex 166 245 41 196617 *~ 0.8;
#P newex 211 158 37 196617 %~ 1.;
#P newex 166 104 63 196617 phasor~ -1.;
#P newex 211 135 35 196617 *~ 5.;
#P newex 166 188 55 196617 sah~ 0.01;
#P comment 281 110 125 196617 Number of teeth per ratio;
#P connect 11 0 12 0;
#P connect 12 0 3 0;
#P connect 3 0 1 0;
#P connect 1 0 5 0;
#P connect 5 0 10 0;
#P connect 10 0 13 0;
#P connect 6 0 10 1;
#P fasten 8 0 7 0 286 215 202 215;
#P connect 7 0 5 1;
#P fasten 3 0 2 0 171 128 216 128;
#P connect 2 0 4 0;
#P connect 4 0 1 1;
#P connect 9 0 2 1;
#P fasten 4 0 6 0 216 181 255 181;
#P connect 8 0 6 1;
#P window clipboard copycount 17;

#76264
May 3, 2006 at 8:53pm

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

Alice

#76265
May 4, 2006 at 2:07am

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.

#76266

You must be logged in to reply to this topic.