Ok so I’ve had my LP Stage for about a year and a half now and I want to start using the audio in. I don’t know how it works exactly, the manual is a little bit vague. Can anyone give me a good explanation? Say I want to plug a guitar into it and use the filter from the LP on it how would I go about doing this? Cheers
Plug the guitar into the Audio In. You then use the LP’s filter settings to change the sound. This can also be done with recorded audio, or any signal that creates noise. I often use it for wind or rain effects by running the white noise from the CP-251 into the Audio in. 
Don’t forget that you have to open up the gate by playing a key or sticking a jack in the Gate In.
Right…I forgot that part. Thanks for the backup.
Yeah, there’s a section in the manual that describes how to do this step by step. There’s a small trick to it so it’s worth a read 
Here are some tips for using a guitar with the LP.
You will hear the straight guitar some but instrument level is not enough, you need to boost it to line level with your amp’s preamp, a mixer, sound card etc.
It’s all the better if you’re using a pedal before (I use Vox Tonelab ST) to round the sound of the guitar. Anything is allowed but cleaner tones through a low pas filter sound more moogish than Yardbirds distortion.
One of the things you’re looking after is the sweep of the filter, preferably fast. This can hardly be accomplished with knob alone, especially with both hands busy with the guitar. At least a standard expression pedal is required. Without it, you’re short in expression controls.
To hear the sound of the guitar alone, you need to turn down the level of both Osc of the patch you are using. With the gate continuously opened, you will lack some of the possibilities of envelopes. These can be acquired in a more elaborate setup. Also the patch you are using will influence the filtering according to it’s settings. Again, you can try many, but a more instrument-like sounding patches will probably have more standard settings. Start from there and build a guitar patch with the filter settings you like. Look into the pole setting for the filter.
Using the expression pedal: a low pass filter gives maximum effect on lower pitch because the highs, well, as soon as they’re gone, they’re gone. That does not mean that a good filter sweep can not include some highs as well. The trick is to set the pedal just the right range for the tones of the riff you are executing. This is accomplished by setting the filter knob on the main panel to a proper position. All the way down (counterclockwise) works well for the lower end (basses), From 9 to 10 o’clock for full range tones including highs. Position beyond 12’oclock don’t leave enough range to the pedal for lows.
I prefer to process cleaner sounds from the guitar through the LP or Voyager but if you want to dirty your sound here, the LP has a nice Overload feature. It works well on basses and highs but is particularly aggressive and expressive with mids, not to mention ear splitting
Finally, don’t forget to select Filter as destination on the mod section an dial in some lfo amount and the wave of your choice. From vibratos to watery effects, all the waveforms are interesting modulating the filter. Actually, if you don’t have an expression pedal on hand, count on the LFO to animate your guitar processing as your main hands off expression mode.
I just revisited the LP (that I have been neglecting a bit lately) writing this. Not only is the LP (almost) as good as the Voyager OS processing guitars but I just had a flash about something I can so with the midi-LP that I can’t do with the non-midi-OS. I just grabbed the new (my xmas gift to me) little Sonuus G2M and plugged it in as a gate processor. The G2M functions quite well as a gate processor. As an audio-pitch to midi converter… well, first results were fair. The thing here is that the G2M midis the gates and notes to the LP as a bunch, but the notes are not sounding in the LP (with both osc levels all the way down), only the guitar with envelopes gated by the little device. That’s a practical application for the little device I want to dig into. Right now, the results are a little rough. Gates are catching well with no latency but unlatch a bit quickly. That can be improved with the tone at the pedal level, and on the synth, with longer volume release envelopes. And then I turn the level up on one OSC, and the G2M generates good notes too, steadier than I remembered from an earlier try. Different guitar though. Yes, working it through, better shaped envelopes give steadier output on sound, and gates (and envelopes) respond to the flick of a string. I did not have gated guitar playing quite like this in my arsenal as of yesterday
Yeah, I’ve tried to do this in the past and it just plays a note from the Phatty sustained, should I turn down the osc levels?
Yes, if all you want to hear is the external audio.
That’s right, that’s the trick. You need to stick a jack in to keep the gate open, and then turn off both oscillators. Then you’re ready to go! Enjoy the OD, sounds awesome on bass imo
You might want to stick a compressor after the guitar so the level is more even going into the LP.