Apantac HDMI-DE HDMI Audio De Embedder w/Audio Delay up to 2700 ms
AC-MX-88HDBT 18Gbps True 4K60 4:4:4 8x8 Matrix w/ Digital Audio & Balanced Audio Out, Built in 4K Up/Down Scalers, and On Board Audio Delay Control. Cascade, up and down scalers built in,
2) Audio Delay Remote Control HDMI CR-62 NEW SEALED | eBay
Lumantek HDMI/SDI Cross Converter with Audio Mux/Demux and Scaler | 1SourceVideo