Most of my callers complains about echo issue. This happens due to delay inserted in playing music due to processing by MS-8 and car's own echo cancellation alog gets messed up.
I heard there is a new firmware for MS-8 in which by pressing mute button it stops all processing (just passthru) hence getting rid of echo issue.
There are other installers who claim they have used MS-8 and there are no echo issue, wonder what is special they have done.
X5 40d M Sports - Fully loaded, 7 seats.
Sold 535d LCI, Xenon Adaptive Headlights, ACC 2 (Stop and Go), LDW/TLC
Retrofits M5 heated/lumbar/memory and active backrest adjustment seats, rear heated and folding g seats, SAT Shifter, paddles (SA2TB), HUD, Rear blinds, Electric steering column, SA430 Folding and EC Mirrors, High Beam Assist, CIC, COMBOX Telematics.