1. Overview

Signal Verification is a fancy name given for what boils down to doing md5 checksums on in-memory buffers of audio-rate signals. Signal verification ensures that the outputs of a DSP algorithms are numerically identical between platforms, refactoring, and other such changes.

Such a system has been used quite succesfully for years in the Soundpipe library and the AudioKit framework. The system used in monolith has been adapated from the one in Soundpipe, and modified to integrate better with Monolith.

Verification in Monolith works by rendering a number of samples of the current graforge patch to an allocated buffer. Then the md5 hash is then taken of the buffer.

A note that endianness is a factor. Monolith up to this point has only been run on little-endian systems. Test suites using signal verifcation on a little endian system will probably break on a big endian system.

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