SP-404SX Updates & Drivers SP-404SX Wave Converter Ver.1.00 for Windows SP-404SX Wave Converter is a software that can write WAV or AIFF files from your computer to an SD card and assign to the pads of the SP-404SX. SP-404SX Wave Converter Ver.1.01 for macOS 10.14 / macOS 10.15 SP-404SX Wave Converter Ver.1.00 for Macintosh