Synthitude!
One time I plugged my iPod’s audio-out to my Voyager’s pitch-in, and the only song I could really get to make a noticeable difference in pitch was a song off of the Fightclub soundtrack.
That’s because the voltage level is not high enough. When I get a chance, I am going to see if I can use my amp head to create a strong enough voltage level (the same going into a speaker). I think this is safe as long as its below 5V but I get nervous with plugging things into the Voyager other the modules or foogers.
Hope you have a voltmeter handy. My Peavey puts 20 volts RMS into the speaker at full volume. 
It’s a small head I just use for experimental purposes so it should be pretty low votage compared to your Peavey.
My Peavey puts out maximum 50 watts. That’s not much…well, by my standards, at least.
I guess if its to high I could step it down. I also don’t know how well a voltmeter will measure audio voltage level. On other way to do this that I though of is using what is called an op amp. These circuts are simple. There are chips which do this with just a few other components.
I do find it interesting with the resurgence of interest in analogue synthesis that there is nothing to convert audio to a CV level of voltage. Perhaps there is from the modular makers but I have not seen it. There are MIDI to CV devices and CV to MIDI but nothing to move audio into the CV range of voltage level.
Another usefull application. What if the delay fooger worked with really short delay time, short enough to create flanging. Then, use an audio CV to modulate the delay. This is the type of out of the box thinking that I like to get into with foogers. I would also love to see Moog lower the minium delay time of the delay fooger but that is another topic.
I think the dot com instrument interface should be able to do this if im not mistaken.
EDIT: I just looked at the instrument interface again, I would think an easy although probably not the most accurate way to make sure you have the right out put would be to match it against the output level of the ringmod carrier out or freqbox osc out until the audio signal your trying to use as a modulator is at a similar level to the carrier/osc out. Plus this module would give you extra trigger/gate/envelope which is always fun
This looks like Doepfer’s version of the same thing:
http://www.doepfer.de/home_e.htm
This also has gates and envelope follower.
A mod to output the fm signal from the freqbox would be very useful, and fairly simple, judging by the block diagram
I do this all the time with line-level audio from my computer without needing an amplifier. I don’t get the full 5v range, but I still get interesting results.
The main program I use is Arturia’s 2600v because it is easy to patch things into the audio outputs and also the oscillators can easily get into LFO range. My computer interface is an M-Audio Delta 44, which is not DC coupled like the MOTU interfaces, but it still works for LFOs.
Anyway, I use these audio signals coming from the 2600v and route them to all sorts of destinations on my Moogerfoogers and Eurorack modules.
I have found that the most usable signals are closer to LFO range, or very low audio-rate signals. Once you start getting high into the audio range everything kinda sounds the same no matter what your audio is.
BTW, I would NOT try to amplify line-level signals before inserting them into your Moogerfoogers unless you have a multimeter handy to make sure they aren’t going above the recommended 5v maximum.
Samples? I will have to try what you are talking about. My only reluctance with amplification has been the +/- 5V range. I think a bit over is not going to harm anything but a lot over probably would and foogers are not cheap.
I will have to give this a try.
I’m trying to figure out what you mean by this. If you are applying FM to the freqbox’s osc then thatll be at the osc out, if you are wondering about the signal that’s being applied as FM, that’s the audio signal that you send to the thing –
If yre trying to describe sth else sorry i totally missed it
I’ll see if I can cook up some demos before the end of the week.
I think the audio input is amplified prior to being used to FM the osc, it is this amplified signal to which i refer.
Here’s a sample using Arturia’s 2600v audio out to modulate the frequency of the FreqBox.
Wow, interesting. OK, the first part is FM. If you modulation the frequency of the freqbox then that is by definition FM. I assume the sample is a voice. That is the problem with a complex waveform, its going to create loads of sidebands and it gets muddy. That is why if you look at a DX7 or the sofware version the FM8 it uses waveforms with only a few partials. A guitar sample might be a bit more interesting because it will stabilize into a waveform with less partials but be muddy in beginning which will sound more colored than muddy.
The truth is, most audio-rate things will all sound the same - buzzy and ringing. It all starts to sound like ring mod. I just did this video to show that you can use audio straight out of your computer without amplifying it.
OK, thanks. Yes, I can see that it works. Complex audio is not promising but some of the stuff you did from the ARP emulation is interesting. I am now wondering what some stuff might sound like from Absynth. Say fooling around with the first three partials. Absynth also also each multi segment to have a different LFO. This might be intersting to fool around so thanks for posting that. I am intriqued.