archidee

I solved it by using a Somfy Izymo Transmitter sending the IO homecontrol protocol to the Velux IO homecontrol receiver by using the generic 2 Relay Blinds (OS2.9+) driver from control4 connected to the Relays 1 & 2 of the EA5 (having to split the coms wire to feed the Relays using the 2 NC connections)'. Downside is that the standard Velux remote is no longer connecting when pairing the Velux receiver to eht Somfy Transmitter despite it having 2 channels. Another disadvantage is that you need 2 of the 4 relays available on the EA5.

you can see it in the sonance setup by entering its ip address in a browser

Is your Subwoofer connected in Bridge Mode or mono Mode? The Control4 driver for the Sonance does not recognize that and will drive the amp wrongly... Hopefully in a new driver update Bridge mode becomes supported.