there are two controls on this patch that could cause "no noticeable effect heard":
CV in 0: tape speed [adc~ 3]
CV in 2: high-frequency rolloff [adc~ 5]
CV in 4: FX send [adc~ 7]
CV in 5: wet/dry [adc~ 8]
if either of these malfunctions (e.g.: is stuck to 0), then you would hear no (or very little) effect.
Try the following patch then open the Bela scope and verify that all pots swipe the full range:
[adc~ 3 5 7 8]
| | \ \
[dac~ 27 28 29 30] SEND TO SCOPE