I can set the tempos that are available to any numbers, and in this case the numbers are in a Golden Ratio:
.tempof1 q2400
.tempof2 q1483
.tempom1 q917
.tempom1 q567
.tempos1 q350
The preprocessor can pick any tempo from those beats per minute, and Csound moves from one to another over time. The effect is to always be speeding up or slowing down to one of those steps.
And it moves to either the next or previous one in the series, like a Markov Chain Drunkard’s Walk algorithm.
Or download here: Jesus, All My Gladness.