Blackstar Infinite Shape Feature (ISF) explained

ISF is an innovative control feature developed by Blackstar Amplification which appears on many amps in the company’s range.

Blackstar says:

When turned towards zero, it gives a tight, focussed, percussive response, characteristic of American amplifiers. When turned towards 10, the response becomes woody, crunchy and warm, like traditional British amps.

Blackstar’s video explains all.

Blackstar website

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