This Module is currently available.
Listen Four Quarters: Four Channel Stereo Mixer with Balanced 1/4" (6.35mm) and Headphone Out
The Listen Four Quarters is a four channel low-noise mixer with stereo 1/4" TRS balanced outputs, and an 1/8" headphone output. Two mono channels with Pan knobs, and two stereo channels with dual inputs provide optimal compatibility with both stereo and mono signals.
Ultra-low noise, typical -100dB signal-to-noise ratio in real world tests. Virtually no background noise or hiss, quiet pots, and smooth panning curves.
The Listen Four Quarters can be daisy-chained to other Listen modules and/or the WAV Recorder.
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These merchants probably sell this module. Huh?