A tremolo in percussion indicates a roll on any percussion instrument, whether tuned or untuned. See pitched percussion instrument for discussion of the differences between tuned and untuned percussion. Both tuned and untuned percussion stops exist (for instance, marimba and snare drum, respectively). Although normally tuned, untuned examples are sometimes used to produce a bass rhythm. This is a partitioned list of percussion instruments showing their usage as tuned or untuned. Instruments in this group are sometimes referred to as non-pitched, unpitched, or untuned. The class-C amplifier has two modes of operation&colon; tuned and untuned. Jad is well known for playing an untuned electric guitar. They are notable for their very repetitive, noisy, untuned, raucous sound. One is the antenna-ground circuit shown in the untuned receiver circuit diagram below. Another major problem was its immature and untuned Ada compiler. This technique, which involved keeping the instruments untuned during the sessions, created additional problems. The Saiyan Saga, being the first release of the game, was mainly untuned. Untuned power output was around , allowing the 3 Litre to reach . The largest (Tenor) bell is a maiden (untuned) bell and is listed for preservation.