Instead of using the usual signals, this RaspTouch lets you enjoy a clean I2S signal. For example, an I2S FIFO 44 / 48MHz Allo Kali reclocker allows the Raspberry Pi's I2S signal to be processed thanks to an Ultra Low Jitter clock fed by LDO and an ultra-quiet power supply, providing high precision. Your system's performance is fast: your music "opens", your sound scene expands, and you can now see sounds that were previously unheard.
This signal is then routed to an Audio-GD I2S module to HDMI, symmetricating the signal. Just plug in your DAC and enjoy.