PiSound
Pisound is an ultra-low latency high-quality sound card and MIDI interface specially designed for Raspberry Pi pocket computers. It is equipped with 192kHz 24-bit Stereo Input and Output driven by the legendary Burr-Brown chips, DIN-5 MIDI Input and Output ports, user-customizable button and bundled software tools. Using Pisound you can turn your Raspberry Pi into a music instrument or effect, audiophile network player, portable recording studio, internet radio station or anything you can think of as long as it’s audio related!
Pisound works great with Raspbian, ArchLinux, Pixel, Ubuntu Mate, Audacity, Pure Data, Sonic Pi, SuperCollider, Volumio and any other Linux software!
Midihub
Midihub is a Stand-Alone MIDI Event Processor & Router. It has classic DIN-5 MIDI input and output ports, 4 of each, as well as a USB port for power and/or communicating with your computer and the Midihub Editor software.
Within the device all MIDI data flows through customizable MIDI Processing Pipelines, sort of MIDI effects, with extremely low latency and without involving any processing on your computer allowing you to integrate Midihub to your computer-less setup.
Midihub can be used as a standard USB-MIDI interface too and it comes equiped with The Button which can send MIDI utility messages such as ‘Reset All Controllers’ or ‘All Notes Off’.