The most basic way to copy a list or an array is simply to assign a new variable with SETQ or SETF, but this may behave in unexpected ways. Let us look at an example: Try running the above in Audacity’s Nyquist Prompt effect (use the Debug button to see the output), and you may … Continue reading Copying lists and arrays
Audacity has a “Change Speed” effect, but it is only accurate to three decimal places. For greater accuracy a short Nyquist script can be used in the Nyquist Prompt effect. In this example the length of the selected audio was 599.999 seconds and I wanted to stretch it to 600 seconds duration.The durations may be … Continue reading Changing the speed and length very accurately
For a shorter display when hours [or hh:mm] are not required, set the ‘short’ parameter to 1. To display hh:mm:ss without milliseconds, set the second parameter [places] to 0. The ’round’ parameter can be set to round up, round down or round to the closest whole number of seconds. For full details of all options, … Continue reading Display time as hh:mm:ss
A common problem for people that are new to Nyquist is how to modify audio samples, for example, to set certain sample values to zero (silence). The temptation may be to read the audio sample by sample and modify them as necessary. In the vast majority of cases this is NOT the best approach as … Continue reading Silence part of an audio track (part 1)
In Nyquist, as with List, there are two types of numbers – Integers and Floating Point numbers. An integer is a whole number with no decimal part, such as 1, 2, 99, 1000000. A floating point number is referred to as a FLONUM, or simply a “float” (floating point number) and is most easily defined … Continue reading Floats and Integers
A couple of simple but useful functions. Hopefully this will save someone several hours of scouring Google. To test the code, copy and paste it into the Nyquist Prompt effect and press the DEBUG button to see the output. [cc lang=”lisp”] ; function to convert a number to a string (defun number-to-string (number) (format nil … Continue reading Converting numbers to strings and strings to lists