This is just a little thing I have been wanting to share with you all. Hopefully it can serve you well like it does me.
This document lays out a few handy things you may need when sampling and editing.
The first half of the chart lays out the sample length of certain notes at various sampling rates. This is useful if you are sampling a note from a synth and want to truncate it and have it loop properly. For instance, on my Korg DSS-1 when I sample a C note saw wave from a synth, I can use this to determine how long one cycle of the waveform should be. Based on the fact that the DSS-1 can sample at 48kHz, I know that a 48kHz sample of one cycle of an oscillator playing the note “C” should be exactly 734 samples long, or a multiple of that. The note one octave up would be half the length, 367 samples in length, and each octave up gets shorter by 1/2 again. I use math instead of my ears to trim the sample.
The second half of the chart has two parts:
One column gives you the sample length per 1 bar at 44.1kHz. This is nice because if you are resampling a loop and you know the BPM, you can determine the exact length in samples to truncate the sample. For instance, most samplers have an auto start feature which begins sampling at the first instance of sound, but you often need to manually trim the end to get the loop to play properly. If you know the BPM of the loop that you sample, you can chop it to the specific sample from this cheat sheet and it will loop perfect. I use this a lot with the Korg ESX when re-sampling. The ESX will auto start, but I can let it record just over 1 bar, then trim the end point with this formula. If it is a beat/riff at 75BPM, I just set the end to 141120 samples and it loops perfect! (aside from possible pops, which may need a miniature adjustment because of a waveform being too far away from “0”, but I believe the ESX automatically quick-fades because I don’t get too many pops.)
The second column gives you BPM to milliseconds. If you have an old school delay and you need to know how to set it to synchronize to your beat’s BPM, use this.
I hope this helps you all out!
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