[PD] fx chaining without glitch

[patrick]

I am trying to reproduce a multi-fx pedal.
So for example:

enable disto:
[adc | disto]

enable reverb:
[adc | disto | reverb]

enable delay:
[adc | disto | reverb | delay]

disable reverb:
[adc | disto | delay]

reenable reverb:
[adc | disto | delay | reverb]

As you can see, I can't decide beforehand the order or make all the
possibilities (i will have around 15 fx). Sorry for my bad
explanation, I think the solution (if there is one) will be different
from what was proposed?