I never tried the Freeverb algorithm.
Just form inspecting the flow chart I suspect its rather colored with all the comb filters.


A classical reverb algorithm would be the allpass diffusors inside a comb filter loop like this

Input -> +-> AP -> AP -> AP -> Delay -> Feedback -> Out
         ^                                |
         |________________________________|

search for Datorro Effects Design for an example of this

Designing reverbs is a huge topic of its own, what you also can try is an FDN (Feedback Delay Network) structure, with the delays tuned to very low pitches spaced in semitones
which will give an effect similar to that of open strings in a piano


Am 16.09.2016 um 22:29 schrieb Spencer Jackson:
Wow, thanks all for the replies!

If I used a reverb would it end up giving the sustained voice too much
character? I was thinking of taking freeverb and removing the comb
filters and just using the allpass filters with 100% feedback thinking
it would make it a "cleaner" sustain. I'm leaning this way because I'd
like to keep it lightweight and I think this will be less overhead
than a phase vocoder. Is that a naive approach?

Thanks again,
_Spencer



On Fri, Sep 16, 2016 at 1:59 PM, Emanuel Landeholm
<emanuel.landeh...@gmail.com> wrote:
Simple OLA will produce warbles. I recommend a phase vocoder.


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