Also there are 3rd party approvals that can hold things up - that little UL, CE, CSA, or FM mark you see on the back. Often products have to be sent to a testing facility and you're basically at their mercy in terms of how quickly they get to testing your product. Then if it doesn't pass and you have to make changes, it gets put off even longer. That just happened to us with a product we planned on releasing in October that's not slated for the end of April if all goes well.
Acoustic/Electric stringed instruments ranging from 4 to 230 strings, hammered, picked, fingered, slapped, and plucked. Analog and Digital Electronic instruments, reeds, and throat/mouth.