ApeDelay Stereo Spectral Delay For iPad July 7, 2015 by iPad Loops, Music Production Apps, And Hardware 0 apeDelay – Implements up to 2048 Stereo Spectral Delay lines with Feedback. The algorithm is based on the STFT (i.e. Short Time Fourier Transform) analysis/re-synthesis. The audio signal is... Effects apedelay, ApeDelay Stereo Spectral Delay For iPad, ipad audio effects, ipad delay, spectral delay.