Korg Mono/Poly

Greetings to all!

A new member here and hope to seek some advise on the current state of my MP

I recently modded the MP with CHD 's midi retrofit. After completing the retrofitting, i ran some tests on the midi functions, they all went according to plan. The only thing its the low audio output for both Headphones and Main Output , sometimes it goes really soft, but not totally silent. 

When the audio is really soft, by Opening up the resonance to full and sweeping the filter , i could clearly hear the filter screaming away as it should but  with extremely soft VCOs in the background. I fiddled around with the ADSR, its all good but with VCOs very faintly in the background.

On a Good Day, the MP works like charm, with full audio output, without the problem mentioned. 

i like to believe the problem i have has nothing to do with the midi retrofit. Hope someone here is able to share where I can start troubleshooting, Thanks in advance

Peace
Jon