the latency will be based on the fft~ size, so you have to have *some* latency, and the tradeoff is "accuracy", which can be subjective…

unless I’m wrong, you will experience some amount of latency with frequency shifts, because it needs a good deal of processing via the fft~ before you can shift it. Hopefully others will chime in here, my knowledge is limited…it’s a big world in there :)

Not sure about reverb, have heard about gigaverb~ but have not tried it…anyone?

Check out yafr2; it’s a free plate reverb model that comes with Max, and it’s simple but sounds smooth.
You also might check out ol.autotalent~ (third-party); it’s a port of the free autotalent (read: autotune) plugin.

You might be able to get around some of the latency by upsampling your gizmo~ patch inside a poly~. That way, you’re processing twice as many samples at once, halving your latency. You can upsample at higher rates, just keep an eye on your CPU usage…