CORE : hosts the Teensy 3.x, provides an AKM AK4558 CODEC with unbalanced stereo input and output on Harwin M20 2x3 female pin headers with 2.54mm pitch, screw terminal for external power input, and Teensy pins breakout on Harwin M50 female pin headers with 1.27mm
IN mini : TRS 1/4" jack or TRS 1/8" jack to Harwin M20 2x3 male pin header, with RFI filter capacitors
IN lite : fully differential stereo line receiver on 2 1/4" TRS jacks to single ended output, with independent volume control, reference level setting (-10dBV or +4dbU) and support for external preamp modules with differential outputs, hosting THAT Corp and TI audio line of opamps
IN hi-z : high impedance instrument preamplifier with single ended input on a 1/4" TS jack, fully differential output and independent gain control, based around TI audio line of opamps
OUT lite : stereo single ended input to impedance balanced (balanced/unbalanced) line output on 2 1/4" TRS jacks, with volume control, secondary headphone output on a third 1/4" TRS jack, switch to select between line out/headphone, with support for auxiliary output amps with single ended input, hosting TI audio line of opamps
PSU D : split supply DC/DC converter with very low noise LDOs, with USB, DC or external power input (max 5.5V), designed for +/-5 V but configurable for up to +/- 15 V, with power output on terminal blocks to provide easy interconnection to all kind of modules, hosting TI line of DC/DC converter and LDOs; USB data lines are offered on a soldering header in order to connect the USB port to the Teensy
More modules to come...