Can anyone help me fix the parameters to keep not continues to create stand alone drone
You can find the DRONE MODE combo in the cheat sheet, available on MoogMusic website.
thanks for reply , I can’t find any chat sheet apart from for sirin which I already have .
This is the one 
EDIT: oups, sorry… had Sirin in mind!
For Sub Phatty or Subsequent 25, I can’t seem to find such a mode. I guess you have to:
1- make sure the filter is open to make sure you are doing next steps correctly,
2- set all the oscillators volumes to zero
3- set the amplitude envelope parameters “full open”, i.e. minimum attack and decay, maximum sustain and release
4- keep the amplitude envelope open as long as you want the signal to be processed. This can be achieved by maintaining a key open or using the GATE CV input with a dummy plug or a sustain pedal. Pay attention to the fact that if the filter KEY AMT parameter is not 0, the filter cut off freequency will follow the key you are pressing.
5- adjust the EXTERNAL INPUT LEVEL (as per manual: shift mode + Noise volume knob)
Hope this helps… better
Hey thatnks for taking the time to help . I did actually remebmeber about using the dummy jack . But just seems absurd theres no latch mode to keep notes running ! also in duo mode it will only drone one note on keyboard with the dummy jack - only way seems to be to keep 2 notes on kb is to hold - its quite annoying !
First off, I’m sorry as I mentioned many points thinking about processing external signal by the Sub 25. Sorry I payed more attention 
My trick when it comes to droning my Little Phatty is a simple one. I’ve used it live several times, really
You could always try the old piece of tape method in a pinch. Use a piece of mixing console tape to hold the key down.