Mod to Mercurial Boost

[waaaaaark]

How simple would it be to modify the Mercurial Boost's frequency range? I'd like it to go up to about 4k.

Thank you

 

[Aleph Null]

Looks like you'd have to reduce C2 and C3, to 6.8nF and increase R7 and R8 to 5.6k. That gives you an upper frequency of 4.2kHz. The Frequency control will have to be increased to allow you to get down to the same low frequency. 250k gives you a low of 92Hz. 500k would go all the way down to 46Hz