# Audio doesn't seem to work
**URL:** https://forum.moogmusic.com/t/audio-doesnt-seem-to-work/22755
**Category:** Little Phatty & Slim Phatty Forum
**Created:** [January 25, 2024, 8:33am UTC](https://forum.moogmusic.com/t/audio-doesnt-seem-to-work/22755 "2024-01-25T08:33:32Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Hisfack](https://forum.moogmusic.com/u/Hisfack)
#### Post date: [January 25, 2024, 8:33am UTC](https://forum.moogmusic.com/t/audio-doesnt-seem-to-work/22755/1 "2024-01-25T08:33:32Z")
Audio in doesn’t seem to work on my slim phatty. I have plugged in a dummy plug to the keyboard gate entry and reduced the decay level of the amplifier envelope to less than 12:00 (while keeping a maximum sustain level), as the manual suggests. I have also checked that filter frequency isn’t too low and that the audio out button has been switched on, but I’ve probably forgotten something else. Any ideas?
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### Author:  [@stiiiiiiive](https://forum.moogmusic.com/u/stiiiiiiive)
#### Post date: [January 25, 2024, 10:45pm UTC](https://forum.moogmusic.com/t/audio-doesnt-seem-to-work/22755/2 "2024-01-25T22:45:52Z")
Hello!
I guess you meant the _audio input_ doesn’t seem to work 🙂
Well, for starters, you can try this:
- Make sure the filter is completely open
- Trigger the volume envelope pressing a key: you should hear the audio signal through.
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### Author:  [@hieronymous](https://forum.moogmusic.com/u/hieronymous)
#### Post date: [January 26, 2024, 5:38am UTC](https://forum.moogmusic.com/t/audio-doesnt-seem-to-work/22755/3 "2024-01-26T05:38:50Z")
Yes, I believe a key needs to be pressed down. I saved this post from Steve Moore of ZOMBI:
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### Author:  [@stiiiiiiive](https://forum.moogmusic.com/u/stiiiiiiive)
#### Post date: [January 26, 2024, 10:39pm UTC](https://forum.moogmusic.com/t/audio-doesnt-seem-to-work/22755/4 "2024-01-26T22:39:04Z")
… or [this one](https://www.instagram.com/dnotmusic/p/BbZBUBvgPmO/), from me, whose first name happens to be Steve too 🙂
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### Author:  [@maxpiano](https://forum.moogmusic.com/u/maxpiano)
#### Post date: [March 13, 2024, 9:34pm UTC](https://forum.moogmusic.com/t/audio-doesnt-seem-to-work/22755/5 "2024-03-13T21:34:02Z")
In fact the LP manual v3.21 reports
\_ **PERFORMANCE TIPS:**
1. You can use the LP to process any audio signal simply by plugging into the Audio IN jack.
To hear the external audio signal without having to hold down a key on the keyboard, plug a
dummy plug (or a patch cord with nothing connected to the other end) into the KB Gate jack.
This will leave the keyboard gate open, and the volume envelope will remain at its Sustain
level until the keyboard gate closes. Due to the design of the envelope circuits, you will need to
turn the envelope Decay parameter down below 12:00 in order for the Sustain level to remain
constant. If you notice that the volume of the external signal begins to slowly fade away, check
to be sure the envelope Decay parameters are not set too high.\_
so maybe you need also to check the Sustain level of AMP envelope?
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### Author:  [@TahuluLimia](https://forum.moogmusic.com/u/TahuluLimia)
#### Post date: [March 28, 2024, 8:11am UTC](https://forum.moogmusic.com/t/audio-doesnt-seem-to-work/22755/6 "2024-03-28T08:11:44Z")
Hey there! No worries, troubleshooting audio on the Slim Phatty can be tricky. Here are a couple of things to check that might be the culprit:
Source and Cable: Double-check your audio source and cable. Make sure the source is putting out a signal and the cable is firmly plugged into both the source and the Slim Phatty’s audio in jack.
Input Level: Ensure the audio source’s output level is high enough. The Slim Phatty might need a hotter signal to trigger the gate. Try cranking the source’s volume a bit.
KB Gate Settings: While you mentioned the dummy plug, have you tried playing some notes on the keyboard itself? Sometimes a stuck key can prevent the audio from coming through the gate.
Global Settings: Check the Slim Phatty’s global settings menu. There might be a mute option for the audio input that’s accidentally engaged.
If you’ve tried all that and still no luck, it’s worth consulting the Slim Phatty manual again for any obscure settings or troubleshooting tips. If all else fails, there might be a deeper issue and reaching out to Moog support for further assistance could be the next step.
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### Author:  [@stiiiiiiive](https://forum.moogmusic.com/u/stiiiiiiive)
#### Post date: [March 28, 2024, 11:27pm UTC](https://forum.moogmusic.com/t/audio-doesnt-seem-to-work/22755/7 "2024-03-28T23:27:46Z")
Mate, pardon me but you sound like an AI, no offense meant 🙂
Some clarifications:
> [@](#):
>
> Input Level: Ensure the audio source’s output level is high enough. The Slim Phatty might need **a hotter signal to trigger the gate.** Try cranking the source’s volume a bit.
The Slim/Little Phatty gate will not be triggered by the audio in. It will by the keyboard, gate input or MIDI note on messages. That’s explained in the extract of manual above.
> [@](#):
>
> KB Gate Settings: While you mentioned the dummy plug, have you tried playing some notes on the keyboard itself? Sometimes a stuck key can prevent the audio from coming through the gate.
The only point which may be missing is that if the gate is configured in legato, you may have to retrigger the gate from time to time if the amp envelope decay setting is wrongly set. Again, the manual extract above explains that later point.
> [@](#):
>
> Global Settings: Check the Slim Phatty’s global settings menu. There might be a mute option for the audio input that’s accidentally engaged.
There is no mute option in the settings, see manual…
> [@](#):
>
> If you’ve tried all that and still no luck, it’s worth consulting the Slim Phatty manual again
Now this is the right piece of advice, which you might not have followed yourself according to what’s above.
MaxPiano did fso or the original poster who hasn’t come back since they created this topic.