When studying the history and evolution of the GRM, one of its outstanding features has been its continuous energy dedicated to developing machines, systems and, in recent years, software that would better serve composers' views and intentions. Unique discoveries were made that have become the fundamental concepts of sound manipulation and have influenced researchers and developers in the conception of new, but always somehow faithful to the original, tools for composition. Many steps pave this road, some are known and recognised, others were necessary failures that permitted inventors to re-focus and realise their thoughts.
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Daniel Teruggi (2007) studied this question.