Booniers drum machine got me thinking about drums again so tonight I made this.

It's 3 techno drums that are quite efficient. The kick and snare contain no oscillators but use a wrapped line segment. Total DSP count - 4 multiplies and a cos. This trick is extended in the snare with a feedback around a second function which results in a chaotic band of noise around the center frequency. Becuase we use [vline~] and always start on the same phase they sound pretty tight.

best,

andy

http://www.pdpatchrepo.info/hurleur/efficient-drum.zip

tweaky freaky circuit bent remix. mysterious parameter version accentuates the twang, excites the feedback circuit a bit more.

http://www.pdpatchrepo.info/hurleur/efficient-concussion.pd

Wow, VERY inspiring! But it dont mean a thing if it ain't got that swing

http://www.pdpatchrepo.info/hurleur/efficient-percussion+swing.pd

this is really interesting, i discovered this while looking for a way to simulate the "bridged t-network" circuit that the 808 bassdrum is based on. i have the efficient-kick running next to a real 808 and fiddle around with the parameters. i can get it to sound very close except for the long decay of the 808 which ends up sounding like a 80s electro drum on the kick. has anybody here tried to simulate the 808 more prrecisely?

hi, I remembered this http://www.soundonsound.com/sos/Feb02/articles/synthsecrets0202.asp
and just now I found this http://kurtjameswerner.tumblr.com/post/50274769999/chuck-tr-808-emulator-bass-drum-bd-emulation

The amplitude envelope should also be exponential probably

i read those articles too, those are excellent! the question is, how do you do it in pd? from what i understand its a dampened oscillator so it should be rather close to efficient-kick.

Well what would be closer would probably be to use cpole~ and use the second article's values for frequency. Then you feed cpole~ some kind of pulse (not sure what kind, band limited, dirac, rectangle, maybe katja's pulse generator), and then convert polar coordinates to real and imaginary parts. For polar phase, you exponentially (using ead~ or something) ramp the phase of cpole~ corresponding to the frequency at that moment. the polar magnitude (constant) is the "decay time". Then take the real part mebe?
edit: see above for an example by katja (the resonator setup)
however this would only be an approximation because the bridged t thing seems to be more like a sharp band-pass filter (which cpole~ is the simplest version of). instead of using cpole~ really the bridged-t filter should be modeled and used. http://music.columbia.edu/pipermail/music-dsp/2005-October/064422.html
maybe vcf~ with high q would be more appropriate? anyway a look at the transfer function of the 808 filter and a bilinear transform seems like the kinda thing to do, i know nothing of analog filters and that stuff...

you can also use ead~ for everything, possibly (frequency and amplitude).
for modifying efficient-kick it would be closer to square or raise ^4 the amplitude of the vline~ before multiplying the cos~
|
| \
[*~]
| \
[*~]
|

thanks for bringing this one back to life. Great thread!!!

this seems to me one of the most efficient ways to simulate physical behaviour of drums. ill have a go at it but im not sure if my pd chops are up for it. thanks for rundown!