Disable internal AGC in AirSpy HF+

Hello, For my purposes in GNU Radio using the osmocom source block i would like to disable the internal AGC in my AirSpy HF+. I see that i can choose the "Gain Mode" setting, however i am not sure that will disable (when set to manual) the AGC on the AirSpy HF+. Do you know of any good way to achieve this? I have installed the following library for the AirSpy HF+, where there is an API which enables you to disable the AGC, however i am not sure how to achieve this in GNU Radio: https://github.com/airspy/airspyhf *$airspyhf_info* AirSpy HF library version: 1.4.2 S/N: "removed" Part ID: 0x00000001 Firmware Version: R1.7.2 Available sample rate: 768 kS/s *$uname -a* Linux hedric-dev 4.15.0-36-generic #39-Ubuntu SMP Mon Sep 24 16:19:09 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Hopefully this is enough information for you, otherwise let me know. Kind regards, Richard