Audio player is a free software for quick and easy playback of high resolution files in combination with the HP-A4 as well as the HP-A8C. It playbacks most of the audio files available from the internet music download and stores up to PCM 24bit/192kHz as well as DSD 5.6MHz. The playable file types include DSF, DSDIFF, WAV, FLAC and MP3. DSD playback on windows complies with both ASIO 2.1 (DSD native, Windows only) and DoP (DSD audio over PCM frames, windows & macOS) in 2.8MHz and 5.6MHz.