[sdiy] Cheapest good sounding digital reverb?

[Mike Bryant]

I thought that at first.  One example I can think of is having a choir spread around a building such as a cathedral, where the different locations of the sopranos, altos, tenors and basses, and of any soloists, would experience different reverberation, giving a greater sense of the size of the building to the overall sound.
Also some of the best church organs were built placing different pipes in optimal locations to emphasise certain acoustic properties of the building.


From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of ColinMuirDorward
Sent: 22 March 2021 12:53
To: Richie Burnett
Cc: *SYNTH DIY
Subject: Re: [sdiy] Cheapest good sounding digital reverb?

Thinking more about this and wondering what would be the sonic difference between polyphonic reverb and "paraphonic" reverb.
Unless each voice is using a different reverb, wouldn't they sound identical? A post-reverb VCA will change this, since you can have different notes gating on and off at different times, but this seems a high price to pay for a very subtle effect. Polyphonic effects I would be chasing are delay, chorus, flange, pitch, etc; those which could take advantage of per-voice dynamic manipulations.

At any rate, I'd love to hear anything that comes out of this, reverb or otherwise. There is probably lots to discover in this under-explored terrain.

Colin

On Mon, Mar 22, 2021 at 10:47 AM Richie Burnett via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>> wrote:
A few general comments:

1. High quality reverb requires a decent chunk of MIPS and RAM.
2. Convincing small rooms with short reverb times are the hardest to do
algorithmically.
3. Different reverb algorithms needed for different sources.  (More/less
diffusion for percussive/pad sounds to trade off density & flutter against
metallic ringing.)
4. 16-channels (or 64 !?) is a _LOT_ of data bandwidth.  Use DMA for the
ADC/DAC/CODEC.

You also need a decent size word-length for the storage and calculations.
Early 16-bit reverbs were very noisy due to build up of quantisation noise
within the algorithm due to feedback.  Use at least 20-bit storage or that
funky floating-point RAM that Keith Barr used for the delay memory.  Or you
might get away with noisy reverbs if you're gonna put a VCA (noise gate!)
after it, but there will always be sounds like a deep mellow bass sound that
will reveal "fizzy" quantisation noise because there's no HF content to mask
it.

-Richie,


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