[Joonas] became frustrated with cheap but crappy MIDI to USB converters, and the better ... him about $5 to build each of his cheap USB MIDI adapters which receive notes and pedal data from ...

or adapter to connect the HDD to your PC. For a barebones setup involving 2.5-inch drives, you can grab a SATA to USB (preferably USB 3.0) converter and call it a day. However, larger 3.5-inch ...