I have recently bought an LP stage II and a few days ago I have noticed that when I am in track mode (my prefered knob mode), active parameters in a preset tend to drift. For example, if the active parameter in the OSC section of a preset is OSC 2 frequency, than a few seconds after I start playing, Osc 2 frequency starts to drift and after 30 seconds or so it is completely out of tune. This drift occures in all sections of the synth and can be seen easily in precision mode where the numbers change though no knobs are turned. Sometimes even the LEDs near the knobs show the drift. As I mentioned before, this only occures in track mode and it seems to be partly eliminated when the knobs are turned all the way clockwise.
Hi folks - new analogue synther + LP SE OS 2.0 owner here; I seem to be having the same problem as a couple of others - LEDs advancing on their own, especially the mod knob, which will go from completely anticlockwise to fully clockwise in 30 seconds (the filter knob LEDs flicker backwards and forwards too). This doesn’t happen at all when using headphones, but intermittently with both my Behringer keyboard amp and when connected to the home cinema aux socket.
When it’s playing up, just touching the jack to the amp’s case will trip the preset switch from amber to red immediately. I assume it’s some rogue charges screwing things up as suggested - very frustrating!
I’ve tried multiple wall outlets and mains adapters (all earthed/grounded) to no avail. Would a special smoothed adapter or something do the job, or do I need to get my house’s wiring checked?!
Hi,
I checked all the connections of my LP and I did not find any problems. But this flaw continues and is very annoying. I ask for help Amos to give a solution to this problem definitively.
Thanks in advance.
Can you actually see the LEDs follow the change in parameters? This never happened with my Stage I but it sounds very odd… I hope it is not a common problem in the SE II’s.
Yes,
i see the LEDs follow the change in parameters.
The problem is not the case if the “pot. section osc.” is completely rotated counter-clockwise
I have a LP Stage I with OS 2.0 .
At this point I believe that it can be a hardware defect on many LP.
But I would to know the cause and the solution of the problem.
I thank in advance someone who can help me.
Regards
Emidio
Thanks Voltor07,
I tried to move to an outlet on a different circuit but the problem remains. I did many other tests before writing on this forum.
Regards
Emidio
I’ve been in correspondance with Amos about this
problem too. I haven’t solved it and noted it on the
forum a few months ago. Amos gave some good
tips that I didn’t get to try and now my Phatty is
temporarily in storage.
It appears that noise is getting into the ground plane of
the phatty and the RAC sensing algorithm interprets it
as a knob change. I’m not sure why this doesn’t happen
with the old OS. For me it is intermittant and appears to
be worse when I run the phatty into outboard FX (DI or
no DI), though it can happen if the phatty is running standlone
with only headphones plugged in.
I had the same problem with the old operating system and also using headphones but the variation of parameters was less extensive than what happens with OS 2.0
What are the tips you gave Amos?
The solution of the problem is hardware or software?
Regards
Emidio
bad earth/ground connection. There are devices which can test the earth ground connection of your electrical outlets. Use one to make sure this is good. Also, the power cord you are using with the LP could have a bad ground connection. This can be tested with a multimeter set to measure Ohms of resistance (between the center/ground pin on the plug end, and the corresponding hole on the IEC socket end of the cable). Less than one Ohm resistance is to be expected on a good cable). If all of these things are OK, then either the chassis ground connection inside the LP is suspect, or the problem has another cause, such as:
stray voltage on the ground wire of your audio cable. I’ve seen this also. Unplug the audio lead from your LP audio output (leave the cable connected to the rest of your system, just unplug the LP end) – measure between the tip and sleeve contacts on the audio plug using a voltmeter; test both AC and DC volts. There should be no voltage, AC or DC, measured here. If there is, then it indicates an electrical fault somewhere in your audio system which is affecting the LP.
