Shponglefan wrote on 2026-05-07, 12:08:

You're mixing up MIDI and audio signals. […]
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DustyShinigami wrote on 2026-05-07, 10:58:

How would this work exactly? Do I need to get and plug in two MIDI cables from the MT-32 and SC-55 OUTPUT into the mixer's INPUT 1 and 2...? And then... what do I connect to the OUTPUT of the mixer...? 😖

You're mixing up MIDI and audio signals.

MIDI is not sound. It is a digital data signal.

The computer sends digital data via the MIDI cable to the sound module(s). The sound module(s) convert that MIDI data into music/sound and then output sound via audio cables to the audio mixer. The audio mixer then sends the sound to your speakers.

Therefore you need to connect the MIDI cables from your computer to the sound module(s). Then you connect the audio cables from the sound modules to the audio mixer. Then your speakers to the audio mixer.

Ah. Okay. ^^;

Yeah, it sounds simple in theory. Still struggling to get my head around it in practise. And also because I only have one red and one white RCA cable connected to the line-in of the sound card, which is for the SC-55. And I don't know what I'll need, or how to connect them, to the 6.35mm adapter jacks I've plugged into the MT-32. Or if I'm connecting these RCA cables to the mixer, how...? I'm so damn confused.

The cheapest option is to get a few of these so you can plug in normal 3.5mm jacks to the mixer
https://www.amazon.co.uk/XINXINGDINGSHENG-Hea … d/dp/B0FXFWZV4K

The mixer you bought has 6.35mm stereo jacks. So you need adapters or cables that go from the hardware you want to connect to it, to the 6.35mm stereo jacks on the mixer.

SC-55 - two RCA jacks (L/R) to a single 6.35mm stereo jack
MT-32 - two mono 6.35mm jacks (L/R) to a single 6.35mm stereo jack
PC sound card(s) - 3.5mm stereo jack to 6.35mm stereo jack
Speakers - (I'm assuming) 3.5mm stereo jack to 6.35mm stereo jack

This can all be done either with adapters or my preference is pre-made cables that have the respective connectors on each end.

You use the respective cables/adapters to connect the audio outputs from your PC sound cards, MT-32 and SC-55 to the mixer. Then connect the output from the mixer to your speakers.

Then you should be good to go.

NeoG_ wrote on 2026-05-07, 13:25:

The cheapest option is to get a few of these so you can plug in normal 3.5mm jacks to the mixer
https://www.amazon.co.uk/XINXINGDINGSHENG-Hea … d/dp/B0FXFWZV4K

Perfect. Thanks for the link. And the diagram. I wasn't sure if the stereo ones existed because when I did a search, all that came up were splitters. One male and two female.

Shponglefan wrote on 2026-05-07, 13:31:

The mixer you bought has 6.35mm stereo jacks. So you need adapters or cables that go from the hardware you want to connect to i […]
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The mixer you bought has 6.35mm stereo jacks. So you need adapters or cables that go from the hardware you want to connect to it, to the 6.35mm stereo jacks on the mixer.

SC-55 - two RCA jacks (L/R) to a single 6.35mm stereo jack
MT-32 - two mono 6.35mm jacks (L/R) to a single 6.35mm stereo jack
PC sound card(s) - 3.5mm stereo jack to 6.35mm stereo jack
Speakers - (I'm assuming) 3.5mm stereo jack to 6.35mm stereo jack

This can all be done either with adapters or my preference is pre-made cables that have the respective connectors on each end.

You use the respective cables/adapters to connect the audio outputs from your PC sound cards, MT-32 and SC-55 to the mixer. Then connect the output from the mixer to your speakers.

Then you should be good to go.

Brilliant. Thanks for the explanation. 😀 Okay, that makes things a lot more clearer. I've ordered some stereo 6.35mm adapters; they should arrive tomorrow. Whew.

Good luck! Hope you're able to get everything connected and working right.

Thanks. 😀 I'll post an update once everything's set up. Or if I run into any issues.

Oh. I also read somewhere, quite possibly in the operating manual of this mixer, which is technically nothing more than a piece of card, that I should hook up a ground loop isolator. I'm guessing that needs to be connected from the sound card first...? The one I bought was this, which didn't solve my problem, sadly:

https://www.amazon.co.uk/dp/B019FC6ZQQ?ref=pp … asin_title&th=1

Basically, I have this noticeable buzzing coming from the subwoofer, which I think is related to my optical mouse...? When I tried the standard PS/2 ball mouse, the problem went away. Either way, when I tried hooking up that isolator, it didn't go away. I've tried connecting it to my main PC, but audio becomes mono...? The right speaker can be barely heard over the left.

Shponglefan wrote on 2026-05-07, 13:31:

The mixer you bought has 6.35mm stereo jacks. So you need adapters or cables that go from the hardware you want to connect to i […]
Show full quote

The mixer you bought has 6.35mm stereo jacks. So you need adapters or cables that go from the hardware you want to connect to it, to the 6.35mm stereo jacks on the mixer.

SC-55 - two RCA jacks (L/R) to a single 6.35mm stereo jack
MT-32 - two mono 6.35mm jacks (L/R) to a single 6.35mm stereo jack
PC sound card(s) - 3.5mm stereo jack to 6.35mm stereo jack
Speakers - (I'm assuming) 3.5mm stereo jack to 6.35mm stereo jack

This can all be done either with adapters or my preference is pre-made cables that have the respective connectors on each end.

You use the respective cables/adapters to connect the audio outputs from your PC sound cards, MT-32 and SC-55 to the mixer. Then connect the output from the mixer to your speakers.

Then you should be good to go.

Hmm. Tried following step by step, but it’s still not working. Not sure what I’m doing wrong. I will need to get another couple of RCA white/red male cables in order to hook the MT-32 up properly, but I’m struggling to get any audio from the subwoofer/speakers through the mixer.

So I’ve hooked the black 3.5mm jack from the output of the subwoofer to a 6.35mm jack. I’ve had this connected to my sound card previously. And I’ve plugged that into Output. Then I’ve connected a 3.5mm to one of the sound cards and the other into a 6.35mm jack and plugged that into Input 1, but there’s no sound. 🙁

DustyShinigami wrote on 2026-05-08, 18:13:

So I’ve hooked the black 3.5mm jack from the output of the subwoofer to a 6.35mm jack. I’ve had this connected to my sound card previously. And I’ve plugged that into Output.

I'm a bit confused by this. Why are you connecting an output to an output? Generally you connect an output from an audio source to an input of what is receiving that audio.

What speakers/subwoofer do you have?

edited to add:

Okay, I see on a previous page you posted a pic of the Yamaha YST-MSW10 subwoofer. Though depending on which speakers you have will depend on how the subwoofer is connected.

But you would never connect the subwoofer output to the mixer output.

Yamaha's manual shows on page one how to connect things up. You just replace the computer in this case with the mixer, and connect the mixer output accordingly: https://usa.yamaha.com/files/download/other_a … 67/YSTMSW10.pdf

Shponglefan wrote on 2026-05-08, 18:27:

I'm a bit confused by this. Why are you connecting an output to an output? Generally you connect an output from an audio source […]
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DustyShinigami wrote on 2026-05-08, 18:13:

So I’ve hooked the black 3.5mm jack from the output of the subwoofer to a 6.35mm jack. I’ve had this connected to my sound card previously. And I’ve plugged that into Output.

I'm a bit confused by this. Why are you connecting an output to an output? Generally you connect an output from an audio source to an input of what is receiving that audio.

What speakers/subwoofer do you have?

edited to add:

Okay, I see on a previous page you posted a pic of the Yamaha YST-MSW10 subwoofer. Though depending on which speakers you have will depend on how the subwoofer is connected.

But you would never connect the subwoofer output to the mixer output.

Yamaha's manual shows on page one how to connect things up. You just replace the computer in this case with the mixer, and connect the mixer output accordingly: https://usa.yamaha.com/files/download/other_a … 67/YSTMSW10.pdf

Oh. Ah. I figured because audio is output through the speakers that they’d need to be connected to the output of the mixer.

As to the setup of the speakers, now that I’ve done it based on the manual, I’ve remembered why - it’s because the cable that should come from the right speaker to the PC/sound card won’t reach. My right speaker is, well, on the right, and my case is all the way to the left.

So, what goes it into the output of the mixer? I’m completely lost with all of this. 😕

EDIT: Wait. Never mind. I’ve got it. Speaker to the output. Although, I’m not sure if my subwoofer is working though. I also had to turn the output dial to full to hear anything.

Ill need to read through this thread. I want to have a good sound set up for my builds. I have an awe 32 with some added ram which I dont know how much is in there yet, an awe 64, a jazz 16 with yamaha OPL chip and a jazz 16 with yamaha OPL. Trying to figure out which card to go with which system.

DustyShinigami wrote on 2026-05-08, 19:19:

Oh. Ah. I figured because audio is output through the speakers that they’d need to be connected to the output of the mixer.

As to the setup of the speakers, now that I’ve done it based on the manual, I’ve remembered why - it’s because the cable that should come from the right speaker to the PC/sound card won’t reach. My right speaker is, well, on the right, and my case is all the way to the left.

What speakers do you have?

And in a situation where a cable isn't reaching, I would get an extension or a longer cable.

Shponglefan wrote on 2026-05-08, 19:43:

DustyShinigami wrote on 2026-05-08, 19:19:

Oh. Ah. I figured because audio is output through the speakers that they’d need to be connected to the output of the mixer.

As to the setup of the speakers, now that I’ve done it based on the manual, I’ve remembered why - it’s because the cable that should come from the right speaker to the PC/sound card won’t reach. My right speaker is, well, on the right, and my case is all the way to the left.

What speakers do you have?

And in a situation where a cable isn't reaching, I would get an extension or a longer cable.

Mine are the YST-M20. That manual lists YST-M10, but not M20 for some reason. But I’m presuming they’re the ones on the left.

I’ve managed to get it all sorted now though. Thanks for the help. Very confusing, but lesson learnt. The only issues I have are that if I move the mixer, it will cause one of the devices to buzz horribly. And the other issue are the cable lengths. Definitely need to get some spare ones so I can hook the MT-32 up. And a longer cable for the speaker to the output.

Also, a ground loop breaker I bought actually makes the speakers buzz compared to when it’s not connected.

For moving the mixer creating a buzz when moved there are two possibilities

- One of the cables/adapters is internally damaged
- One of the mixer jacks is faulty

Wiggle and rotate each cable individually without moving the mixer to identify which cable is causing the buzz. Move it to another free input on the mixer. If the problem stays the cable/adapter is damaged. If the problem goes away the mixer jack is faulty.

NeoG_ wrote on 2026-05-08, 21:41:

For moving the mixer creating a buzz when moved there are two possibilities […]
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For moving the mixer creating a buzz when moved there are two possibilities

- One of the cables/adapters is internally damaged
- One of the mixer jacks is faulty

Wiggle and rotate each cable individually without moving the mixer to identify which cable is causing the buzz. Move it to another free input on the mixer. If the problem stays the cable/adapter is damaged. If the problem goes away the mixer jack is faulty.

I really hope the mixer isn't faulty; it's supposed to be like-new. I think the one making the noise was the cable from the speaker to the output. I'll have to wiggle them one by one and check.

Yeah, it’s definitely the speaker cable in the output. I’m hoping a longer cable solves the issue. It’s worse when I try and lie it flat, but it stops if it’s stood up.

I've had so many 3.5mm jack cables go bad, it's pretty common to happen. The one cable that has never failed me is a cable from a Cambridge Soundworks DTT3500 speaker set from 2000, still going strong.

NeoG_ wrote on 2026-05-08, 23:20:

I've had so many 3.5mm jack cables go bad, it's pretty common to happen. The one cable that has never failed me is a cable from a Cambridge Soundworks DTT3500 speaker set from 2000, still going strong.

Wow. I’ll certainly order some more. Though switching 3.5mm cables still does the same thing. So it could be the output. 😕

Okay, it looks to happen only when a certain device, or number of them, are plugged in. Just the speakers and a sound card and it’s fine.

It appears to be the SC-55 for some reason. And in each of the inputs. Unless the volume is turned down.