Hi,

What are everyone's favorite sound card or audio interface for Raspberry Pi? I'm on a Raspberry Pi 3, but I'm curious about any interface. I have the IQaudio Pi Dac+. It is really great, but it doesn't have audio input. I would love to get something with RCA, 1/4 inch or XLR audio input. Does that even exist? any suggestions are appreciated. Thanks.

Behringer has a very cheap interface that has two RCA audio inputs, without pre-amp. It should cost around 30 euros. Pisound is one of the latest sounds cards for the Pi with a stereo jack input and output. This costs around 80 euros though.
I've been using Focusrite Scarlett sound cards with embedded computers like the Pi or the Odroid (or even my laptop) and Linux in general and they work really great. Of course they're not meant to be embedded, but if you're up for hacking them and tearing them off their housing, they could be an option. I'm using a Focusrite Scarlett 2i4 in my 3dPd modular synth, which runs on an Odroid-U3, posted here https://forum.pdpatchrepo.info/topic/10845/3dpd-a-physical-modular-synthesizer-programmed-in-pd-and-arduino

@alexandros Thank you for the great list of resources. I'm checking them all out now. The Pisound looks good. I've checked it out before and the volume knobs on top of the board initially turned me off to it, but I guess you can mount them on a panel or something so it shouldn't be an issue.

Anyway thanks and if you hear of anything else please let us know.

Been using the Pisound HAT for close to a year. Originally bought one (took a while to get to me), played with it for a while. Ordered a second one after realizing that it was a pretty important tool for me. (Paid for the fast shipping, second time around.)
One Pisound-based setup is focused on MODEP (MOD Emulation for Pisound). Used it on several occasions, including during a Drone Day jam recently. The other is more of a music-focused Raspbian install, with Sonic Pi as a key piece of the puzzle but some Pd patches here and there.

The Pisound has quite a bit going for it. Not the least expensive, and some might argue that other platforms can give you similar results for cheaper but… Blokas has done a great job to integrate things, hardware and software. Those knobs are quite convenient. Even the single button on it is quite useful. The community is small but healthy. And there’s a whole lot to be said about MODEP, given how “plug and play” it is. There aren’t that many LV2 plugins available, but it’s more than enough to have quite a bit of fun without having to set things up every time.
The “normal” Raspbian setup allows you to boot directly into a given Pd patch or switch them around using a USB key. Haven’t really played with that but that’s a pretty neat feature.

@Enkerli Wow thanks for the tip. The Pisound Hat looks really cool. I have been using the Pi-Dac+. It sounds really amazing, I gotta say, like really great. And it has stereo RCA outputs, but it has no inputs so it's pretty limited in that way.

I'm going to pick up some Pisound Hats and try them out.

thanks.