@scumvullage recently said he’d got bsaylor partconv~ to work… but it consuming all cpu.
generally convolution reverbs are pretty cpu intensive.
not sure if there are any that take enough shortcuts to be done on smaller devices.
that said… bela faq says:
Can it do convolution reverb?
“A few years ago a student in our lab implemented a convolution reverb on a standard, unoptimized Beaglebone Black, with impulse responses as long as 12 seconds. So yes, the processing power is there.”
and the Organelle has the same kind of processing power, so perhaps the right algo can make it happen 
