[sdiy] Cheapest good sounding digital reverb?

[Mike Bryant]

Agreed it's much more efficient.  But the Midas M32 for example does allow 8 different stereo reverbs to be applied to parts of the total mix.  But whether you can use this sort of power well is another thing.


-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Richie Burnett
Sent: 22 March 2021 16:39
Cc: *SYNTH DIY
Subject: Re: [sdiy] Cheapest good sounding digital reverb?

This is very true.  Most reverbs have just one (mono mix) or two (stereo) inputs to the reverb algorithm, whereas in practice every instrument is in a physically different place within a room.

It's still easier (and much more computationally efficient) to feed multiple sources into one reverb algorithm in multiple different places than it is to implement a multitude of separate reverb algorithms in parallel though.

But of course you can't gate the reverb from those multiple different sources independently.  Once the energy has been put into the tank it all gets mixed together.  The all-pass diffusers do a good job of shuffling it around on every pass round the loop!


-Richie,



-----Original Message-----
From: Mike Bryant
Sent: Monday, March 22, 2021 4:26 PM
To: ColinMuirDorward ; Richie Burnett
Cc: *SYNTH DIY
Subject: RE: [sdiy] Cheapest good sounding digital reverb?



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> 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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