I was looking through the episode guide when I read a description of episode 10. Could this be soundwave? http://www.cartoonnetwork.com/tv_shows/transformersa/index.html go to episode guide, episode 10.
or maybe its one of his cassette bots from toy pics hes a box car with a massive stereo system and LB as a guitar maybe rumble or frenzy turn into ipodsthat jack into SW i mean this is 2050 right
Maybe one of Soundwave's minions. Although it might also be Megatron's head remote controlling the toy, as the information we have on him is that he is able to remotely control machinery.
Hmm I'll stick that its soundwave and as mentioned by Sol Fury Megatron is like a remote so he could create soundwave but its a toy and soundwave is a vanbut later on he could turn into a van?