Highpass filter solved

If you want to do some realtime highpass filtering, then download this:

http://www.eimer.dk/Filter.zip

and dig the file on the MPC.


(Sorry about the bad music, i just grabbet the first but not the best cd to sample from. It's danish Me&My, ugly stuff!!)

thanks for this - but i'm unsure how to use it -

I downloaded it, unzipped it and then (to check out what you did) opened it with mpc187 on my laptop.

is that how other people do highpass filtering, using the option on mpc187 or a longwinded way on the actual mpc?

You need to open it on the mpc! I did it with the phase shift theory. The same sample is copied in two. One in phase and another 180 degree out of phase. When they are played at the same time they will cancel eatchother out, bot when one sample is lowpassed, every frequency that's above the lowpass cut is not cancelled out because there's nothing to cancel it out (it's cut away). This result in a highpass effect. The two only drawback's polyphony killer and double memory needed.

Theory:
http://en.wikipedia.org/wiki/Phase_shift#Phase_shift

Holy drumbox, Batman, how did you do that!?

I tried that a year ago, but I had difficulties with subtle timing issues, see: viewtopic.php?f=26&t=72485

Has Akai improved the sample trigger timing, or what's the trick?

I think that you reversed the sample rather than repolarized it. But it was actually your idéa that inspired me. Thanks! Use audacity (freeware) to reverse the polarity of the samples