Low latency loopback with Digi+ I/O, sending S/PDIF in to both S/PDIF out and HDMI

I have an S/PDIF input (PCM 44.1kHz or 48kHz depending on the source) being sent to the Digi+ I/O card and I want the signal to be sent directly to both the S/PDIF and HDMI outputs. I got this to work using PulseAudio module-loopback or arecord piped into aplay. However, the latency seems to be pretty high. I haven't measured it precisely, but it feels like it's around 250 to 500 ms.

Is there some low latency way of doing this? Thanks in advance

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