hmmm....
well if no source code for Jesusonic (0.991 that is)
what about calf studio ?
soooo...
the n900 does have ladspa (if I remember right)
perhaps a python frame wrapped around ladspa utilizing calf plugins?
not just any calf will do ...either...
for ladspa...and calf to work ...
you need better than calf...
you need ...
(wait for it..)
Veal.

hahaha
yup.
Veal is calf for ladspa

https://github.com/LMMS/veal

TheLast remaining LADSPA-capable fork of the Calf Studio Gear audio plugins ..

whaddya think guys ?

oh ...wait...Veal runs through LMMS ..and that is pretty much an easy debian nightmare...LMMS just never played well with others when it came to our devices...
If I remember some got it running ...somewhat ok...on the n810...
But seriously mixed results, and now easy debian for the n810 is so old ...forget trying to do a decent install of virtually anything.
and I don't think LMMS worked on the n900 at all..
too many problems..
But I could be mistaken...

shame about Jesusonic though...
THAT ...as simple and archaic as it seems ...can do more than all the prefabricated unalterable stuff out there.
You can easily create your own effects with jesusonic ..
pity...
just have to keep using it on laptops instead.
and continue with gtkgep on my nxx0's