5/2/2023 0 Comments Fp plugin fade![]() ![]() My preferred solution is using control-srate-abs. 1.5 samples at control rate = 30 samples at sound rate Or slightly less code: (setf val-start (db-to-linear -30)) (mult *track* (pwlv val-start 1 val-end end val-end)) (setf end (/ end (get-duration 1))) scale to warp factor (setf end (+ (get-duration 1) (/ 1.5 *control-srate*))) length plus 1.5 samples at *control-srate* Extend the control signal by 1.5 samples (control-srate-abs *sound-srate* (pwlv val-start 1 1)))Īnd another way is to slightly extend the control signal so that it doesn’t run out of samples at the end: (setf val-start (db-to-linear -30)) One way to do that is to set the control-srate the same as sound-srate: (setf *control-srate* *sound-srate*)Īnother way is to force the evaluation of PWLV at sound-srate: (setf val-start (db-to-linear -30)) One way or another, the control signal must be coaxed into maintaining the correct level up to the final sample in the selected sound. ![]() The final sample at the control sample rate is earlier than the final sample at the sound sample rate. ![]() (force-srate *sound-srate* (pwlv val-start 1 1))Īnd if we zoom in on the end of the ramp that is produced, we can see the problem clearly: If we force the sample rate of the control signal back to the track sample rate, then we can see the control signal on its own: (setf val-start (db-to-linear -30)) With the setting “-30” and “0”, the code effectively boil down to: (setf val-start (db-to-linear -30)) Try this: (format nil "Sound sample rate = ~a Hz.~%Control sample rate = ~a Hz." *sound-srate* *control-srate*) By default, control-srate is 1/20th of the sample rate (this can give better performance for some plug-ins as a low sample rate control signal will have only 1/20th of the samples compared to what it would have at the sound sample rate). The reason that this happens is because Piecewise Linear Approximations (the “PWL” family) produce a control signal at the control signal sample rate control-srate. The settings tell the effect to fade up to unity gain, but it actually does a little fade-out at the end. In the case of the new Fade effect, the problem is that it is not doing what it was told to do. It may not be possible for the transition to be smooth at the end without applying a crossfade because it’s likely that the phase of the waveform will be different from the original. Ideally this would be smooth at the ends, or at least smooth at the start. In this case it is a limitation of the (very complex) pitch change algorithm. In this case, the glitches at the ends are expected because it’s doing exactly what you told it to do. The previous version had a problem with control-srate. No reason why it should not work on any version from 2.3.1 up to the very latest. Only tested the plugin with Audacity 2.4.2 running on MacOS and Win 10. The very last fade goes from 0 dB down to -30 dB. Same applies to Fade “F” but with values of 0 dB, which means untouched.įade “B”, start = -1.95 dB, end = -3 dB (remember that the original audio had a level of 0 dBFS). When the start and end values are equal, the selection will have an equal level from start to end. 0 dBFS).įade “A” has a start value of -1.95 dB and an end value of -1.95 dB (Please don’t do crazy things like adding 30 dB of gain to a selection that is already at 0 dBFS).Īll examples are with a tone of 1 KHz and a level of 1.0 (i.e. ![]() The two controls are pretty self explanatory.īelow then, a few examples of what can be quickly done. To use, make a selection of the desired audio region, then use the Fade-in-out plugin. I’m used to thinking in dB’s rather than say 50% or 0.5. Please note that the start and end points are specified in dB (min -30 and max +30) and not in percentages or ratios. It allows arbitrary fades (in and out) and level adjustments of a selection, without the need to use the envelope tool. The current fade in, fade out and amplitude effects in Audacity were taking too much time, so created my own plugin. However, the noise, clips, etc, need some “creative” level and fade adjustments at certain points. (Which I then apply filtering and reverb to, and sometimes reverse or pitch change as well). It involves creating some weird space type effects which I create using noise, tones and existing sound clips. Recently got a project to create some SFX for a TV series. ![]()
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