It doesn't appear to be possible to stretch a clip with precision and preserve the waveform

[Trebor]

@apteropith

none of the text-entry boxes in effects or the “change pitch and speed” dialog allow me to input this precise an adjustment, not even close

Nyquist Prompt allows specifying speed change with greater accuracy …

(force-srate (* 1.0000386 *sound-srate*) *track*)