Hi Musicday, This is the picture on hearing test on the left is dap using dac chip es9023 asynch using 50mhz clock+ad8397 as internal amp and the left is the dev board using tda1387 and passive resistor and several dac chip module to be rolling..and there a semi final picture, it not final yet since the player will be engrave. Please be patient for the dedicated thread since the tester for 10 dap on 1st batch will be final on next week. and we will find out how is the final result. (already revision from the lates I test and send an input to the builder) you can see it really neat and simple, only arm m4 for the cpu using 1 clock to process the sample rate to 24bit - 192khz, the digital data decode and process using assembly language.. dac chip and internal as mention above. only capable playing wav, builder say new FW can decode mp3 and flac but still need to wait.