Hi,
Please create the POWER SOAK for the Helix
This attenuator was created by Tom Schultz from the band Boston.
This iconic device was placed between the speakers and the cab, stepping down the volume of a tube amp running at high volume.
The result is a tone that is very uniquely the Boston guitar tone.
Here is a review and links to audio samples of the product to get you started.
https://www.rockman.fr/Reviews/Power_Soak.htm
Regards,
Allan