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A low latency guitar effects processor suitable for running on a Raspberry Pi

github.com

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Re: A low latency guitar effects processor suitable for running on a Raspberry Pi

#21

Post by weberer »

tcrenshaw wrote: post #14
DeathArrow wrote: post #9

I thought is hard to have low latency audio in Linux with stuff like PulseAudio.

Nah, low latency audio is absolutely possible, but not necessarily using pulse audio. Using either Jack for the low latency stuff has been the advice for years, but with the advent of pipewire you can mix and match without too much difficulty. A quick skim didn't turn up what audio backend this project is using, but I'm using patchbox with modep on my Pi4 as a bass pedal board and it's pretty much flawless low latenc…

Sep 2 of the build instructions says it requires RtAudio.

Re: A low latency guitar effects processor suitable for running on a Raspberry Pi

#22

Post by TylerE »

digitallyfree wrote: post #18

I'm still patiently waiting for future digital mixing consoles to do all processing in software on inexpensive x86 or ARM processors. Currently due to latency and reliability requirements all DSP work is done on dedicated chips or FPGA which brings up the BOM and engineering cost. They often have a small ARM/Linux module which is used for the displays and network control. The CPU tech is here today, and modern genera…

Modern CPUs are great if your watt (and thus thermal) profile is unlimited.

Not so great when they aren't.

Re: A low latency guitar effects processor suitable for running on a Raspberry Pi

#23

Post by huehehue »

digitallyfree wrote: post #18

I'm still patiently waiting for future digital mixing consoles to do all processing in software on inexpensive x86 or ARM processors. Currently due to latency and reliability requirements all DSP work is done on dedicated chips or FPGA which brings up the BOM and engineering cost. They often have a small ARM/Linux module which is used for the displays and network control. The CPU tech is here today, and modern genera…

Not exactly what you're describing, but I've been running my band directly into Logic Pro on an M1 (both for recording, and live shows). Dry signals go through amp sims and effects processors, and then route to both a FOH mix and an in-ear mix all on the laptop.

Wish I had seen the OP's project months ago, but one bonus of the setup I describe is the ability to swap effects after the fact (by virtue of having the dry signal) and the ability to automate effects (so I can engage distortion etc as soon as we hit measure XYZ instead of having to click a pedal)

Re: A low latency guitar effects processor suitable for running on a Raspberry Pi

#25

Post by strangetortoise »

TylerE wrote: post #22
digitallyfree wrote: post #18

I'm still patiently waiting for future digital mixing consoles to do all processing in software on inexpensive x86 or ARM processors. Currently due to latency and reliability requirements all DSP work is done on dedicated chips or FPGA which brings up the BOM and engineering cost. They often have a small ARM/Linux module which is used for the displays and network control. The CPU tech is here today, and modern genera…

Modern CPUs are great if your watt (and thus thermal) profile is unlimited. Not so great when they aren't.

Does this form a problem for digital mixing consoles? As far as I know, these already have fairly beefy fans for heat exhaust, so I don't know if they couldn't just add more airflow?

Re: A low latency guitar effects processor suitable for running on a Raspberry Pi

#27

Post by jnovek »

metmac wrote: post #15

While not a guitar effects box another project that does low latency audio things with an RPI at it’s core: https://monome.org/docs/norns/ Open source version: https://monome.org/docs/norns/shield/

This is a neat little box, but pre-soldered ones seem to be only available on the used market. There are bare PCBs out there, but I’m not very confident with SMD parts.

This is the thing that bums me out with DIY audio: people come up with extraordinary designs, do a limited run and then never (or rarely) make any more.

Re: A low latency guitar effects processor suitable for running on a Raspberry Pi

#29

Post by rotexo »

metmac wrote: post #15

While not a guitar effects box another project that does low latency audio things with an RPI at it’s core: https://monome.org/docs/norns/ Open source version: https://monome.org/docs/norns/shield/

Also Pisound (https://blokas.io/pisound/) which has the benefit of built-in din MIDI, but without the active community sharing software (you kind of have to build everything yourself with PD or SuperCollider). Some people have gotten Norns running on pisound, but I could never get it to work.
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