A paper on the Roland TR-808 cowbell at academia.edu
"ABSTRACT
We present an analysis of the cowbell voice circuit from the Roland TR-808 Rhythm Composer. A digitalmodel based on this analysis accurately emulates the original. Through the use of physical and behavioralmodels of each sub-circuit, this model supports accurate emulation of circuit-bent extensions to the voice’soriginal behavior (including architecture-level alterations and component substitution). Some of this behavioris very complicated and is inconvenient or impossible to capture accurately through black box modeling orstructured sampling. The band pass filter sub-circuit is treated as a case study of how to apply Mason’sgain formula to finding the continuous-time transfer function of an analog circuit."
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