I will leave a video for reference so you can hear what the voice sound like 

                                                           https://www.youtube.com/watch?v=ZniTXUSGcyA

dave is a constantly metamorphosing bug mute. He is a surface scavenger along with his human partner Benson, his voice is kinda deep .Dave's personality generally depends on his current life cycle stage. As a larva and little grub, Dave is needy and 100% dependent on Benson as he must be carried everywhere. In his teenage form, Dave suffers from raging hormones. As a regular or super buff adult, Dave is a scrappy, suspicious, arrogant, melodramatic, and self-centered wise guy. His strongest and most useful form is also his shortest and most unreliable stage.