the OPTCB works great with the Benedini mini sound board for tank engine sounds (for throttle up/down), and for lights, and MG sounds, and many other sounds.
http://www.benedini.de/html/sound.html However, I have not listened to all Benedini sound files (
http://www.benedini.de/html/demo.html#Sounds) for boats (he has some boat sounds). He probably has 50 cal sounds since he has the Sherman. You can email Benedini for more info. He is quick to respond. You can also add you own sounds to Benedini mini and trigger them with the OPTCB
Remember to read this:
http://openpanzer.org/wiki/doku.php?id=wiki:tcb:tcbinstall:rxUsing the OPTCB for twin engine boat would be a cool project since you can mix power to the motors if you wanted on one stick (2 channel, for RIGHT F/R and LEFT F/R), or just run them on a single channel for F and R. You can assign the other stick to rudder.
The OPTCB allows you to control many channels for anything such as rotating and elevation of guns, ramp control, break-out boards, shields, etc. The OPTCB is VERY flexible for all different set-ups AND the OPConfig is easy to use (real reason I bought one). No point in having a great control board if you can't easily change something. For example, you could assign 2 of the pots on the RadioLink AT10II to control 50 cal rotation and elevation, and use the MG to fire on a momentary switch (top right on the RadioLink), and the sticks for motors and rudders.
I am using the RadioLink 12 channel AT10II sbus system. works without issue with the OPTCB. Download the OPTCB configurator and play around with it to get an idea of what you can do.