TC Electronic Spark Booster - Manual (Page 5)

5
1 - Effect on/off (true bypass)
2 - 1/4 inch mono jack input
3 - 1/4 inch mono jack output
4 - Bass control
5 - Treble control
6 - Gain control
7 - Level control
8 - Voice selector (Fat/Clean/Mid)
9 - Power in (9VDC)