So, you have built an electric cigar box guitar and started to get playing, only to realize that you don't know how. In fact, you can't even keep time. Your playing keeps getting faster and slower. It sounds like you need a metronome. A metronome is a device that helps you keep a steady time when you are playing an instrument by making a tick at a regular interval that you pre-set. If you have a little bit of electronics knowledge, it is very simple to build an electronic metronome.