Pimoroni pHAT DAC pin use

Hi,

I've setup a Raspberry Pi B with Shairport to AirPlay music to my speakers. Works a treat, however the audio quality is poor and volume is low. I'm therefore looking to add external sound to fix both these issues.

Also considering replacing the Pi B with a Pi Zero.

Problem is I'm also using GPIO to turn my speakers on and off via a relay.

I was wondering if the Pimoroni pHAT DAC used all the pins? If not, which ones are available for other use?

Thanks for you help!

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