An explanation of the ISF tone control, an exclusive feature from Blackstar Amplification





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Published on Mar 16, 2011

The Infinite Shape Feature control can be found on many Blackstar products from lines such as Series One, HT Venue series and selected pedals.

But what is ISF?
This short animation should hopefully explain some questions you may have.

ISF is an innovative control from Blackstar Amplification. When turned towards 0, it gives tight, focussed, percussive response, characteristic of American amps. When turned towards 10, the response becomes woody, crunchy and warm, like traditional British amps.

Bass Mid and Treble controls can be found on almost all modern amp designs, but by varying component values, each company has developed it's own signature sound. However, these signature sounds are only snapshots of the wide tonal spectrum available.

The blackstar patented infinite shape feature (or ISF) shifts the whole tone control network. This lets you match the snapshots from established brands as well as the infinite options of any characteristics in between them.

This means that the signature sound of your amp, is decided by you.

Our aim is to give you the tools to find the sound in your head.

ISF is different to a contour control or a parametric EQ, which sound unmusical and suck the life from your tone.

The ISF network's response is identical to the traditional passive guitar network. Bass mid and treble controls remain interactive, which is key to the musicality of the circuit

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