This paper describes the process developed by Marcello Sfoggia for recording acoustic and classical music in south of Brazil, making intensive use of custom equipment. Sfoggia spent most of his lifetime building dedicated circuits to optimize sound reproduction and recording. He took the task of registering major performances in the city of Porto Alegre, using his home-developed equipment, what became a reference process. We describe the system employed for both sound capture and mixdown. Key components of the signal flow include preamplifiers with precision op-amps, short signal paths, modified A/D/A converters and the mixing desk with pure vacuum tube circuitry. Finally, we address our current efforts to continue his activities and improve upon his system with updated circuits and techniques.
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