4ms Sampler Manuel de l'utilisateur - Page 13

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4. Now turn Start Pos down slowly. The sample should play backwards! Notice that no matter how

fast you turn Start Pos, the pitch does not change. That is, you can play the sample faster or

slower without changing its pitch. This is time-stretching in its most basic form.

5. Now turn Length up a tiny bit. Hear how the buzzy overtone changes? Length is setting the size

of the grains.

6. Let's use an LFO to sweep through the sample so you don't have to do it by hand. Patch a very

slow ramp-up LFO into the Start Pos CV jack. A Pingable Envelope Generator, a MiniPEG, or

any of the EnvVCA family of modules are great for this. The period of the LFO will equal the

playback time, so make the LFO's period is several seconds long. Make sure the Start Pos knob is

back at 0. For full range, the ramp-up LFO should be 0V to +5V. Attenuate or shift as needed: any

voltage under 0V or over +5V will make playback "hang". When the LFO is exactly 0V to +5V, you

should hear the entire sample being played forwards. Adjust the LFO speed to adjust the playback

speed. Also, you can attenuate the LFO and/or adjust the Start Pos knob to select certain portions

of the sample to playback.

7. Try different LFO wave shapes: ramp-down will play the sample backwards, triangle will play it

forwards-backwards, curved waves will play it at variable speeds (constant pitch).

8. Next, let's get rid of that buzzy overtone. Patch a random LFO (or a simple triangle if you don't

have a random source) into an attenuator module. Attenuate the signal heavily, down to about

+0.5V max. Patch the attenuated random LFO/noise into the Length CV jack. Make sure the

Length knob is turned all the way back down. The overtone should now be randomized enough

that it disappears. Adjust the attenuation and/or random speed and/or Length knob to suit your

taste.

9. To change pitch without changing the playback time, simply adjust the Pitch knob (or use the

Pitch jack). Since the playback time is set by the LFO in Start Pos CV, you can freely adjust Pitch

without changing the timing. Likewise, you can adjust the playback timing without adjusting the

Pitch.

Random Grains

Scrubbing involves playing the grains in order, but you also can play grains in random order. Patch the

random LFO into Start Pos CV instead of Length CV, and don't attenuate it as much (or at all). Then

you can leave Length CV unpatched, or patch some other LFO into it to vary the grain sizes.

Clock Sync and Shifting Ping-Pong Loops

Find a sample with rhythmic elements. Hold Play to make it loop. Turn down Length to between 50%

and 90% to make a shorter loop that you like.

Clock Sync:

Run a clock into the Play Jack to sync the loop to the clock. If the loop is shorter than the clock, the

sample will loop until the next clock.

Shifting Loop:

Patch a very slow LFO into Start Pos CV. Each time the loop ends, it'll start in a new position, based

on where Start Pos CV is at the moment the sample re-starts.

Ping-Pong:

Patch End Out into Reverse to play the loop forward/backwards/forward/backwards

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