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Routing multiple keyboards to amp


mrjamiam

Question

Posted

I admit it, I've been unfaithful.  I love my Hamers, but I have curiosity and appreciation of keyboard sounds, too.  So, I have accumulated a few keyboards.  But I want to keep this deviation under control, so I only have one solid-state keyboard amp with two inputs to listen to them.

Set-up goes like this:  MIDI-only (i.e. no instrument out) keyboard and pedalboard (for organ) controllers, stage piano with both MIDI and instrument out, organ synth with both MIDI and instrument out, and two other synths with both MIDI and instrument out.  Not yet in my hands but likely sometime before Christmas is another small synth with MIDI and instrument out.  MIDI is both in and out for the devices with instrument out.  So I need to route both the MIDI signals among the devices and the instrument outs to the amp.

For the MIDI, it looks like there are merger boxes that combine MIDI signals from multiple devices into one MIDI signal, as well as thru boxes that take a MIDI signal and make multiple copies for routing to multiple devices, although I haven't seen any yet that do both in one box.  So, I can for instance merge the MIDI keyboard and pedalboard into a single signal for the organ synth.  Of course I will have to assign the device ID numbers for the MIDI messages properly so that the correct device acts on the signal received.  I have some learning to do and experience to gain, but it seems achievable to link everything together.

It's a little more aggravating on the instrument signal side.  At first I looked at ABY boxes, but they seem to be invariably a single input to two outputs.  Right now my best option looks like a Morley ABC box that can either distribute an input to three outputs or collect three inputs and send them all to an output, which is what I need.  Since it's three into one, I'd need two to collect what is probably soon to be five instrument outs into the two inputs of the amp.  I've seen some discussion on different boards, and while people talk of mixers, it seems that mixers are looking for either mic level or line level signals, which would mean more boxes.  If there is an advantage in doing that, I could go that way, but the seeming simplicity of the ABC box is appealing.

Cost is always a consideration, but for what I'm looking at at the moment (MIDI merge, MIDI thru, and two Morley ABC) it's under $500 to give me the ability to just power everything up by stepping on the switch for the power strip, and having it just work.  I know that for no additional expenditure I can just switch cables for whatever noise I feel like making each time, but I'm tired of that.

Are there other options I should be looking at, for either the MIDI (at which I am a beginner) or the signal collection?

6 answers to this question

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Posted

You can solve the audio problem with a small mixer.  They make mixers specifically designed to handle multiple line inputs. 
Google keyboard mixer and you’ll see you have a lot of choices. I admit I’m not really an authority on midi.  Most gear usually has an in, out, and thru. Linked together it should pass data throughout the chain. Like you said you will need to assign them specific channels and such. Good luck. 

Posted

Yep, small mixer, Mackie makes some small good sounding units. I use one for Solo Duet stuff. 

Posted

I picked up a used Allen & Heath ZEDi-10FX for around 180.  Been happy with it.

Needed to mix a few keyboards and instrument audio, connect my monitors, and interface w/my DAW. I'll probably upgrade to a better audio interface for the DAW one day, but this one is just fine for now.

UMZWTe0.jpg

Posted

Thank you for the responses!  So the instrument level vs line level isn't the barrier some internet "research" led me to fear?  Are mic level and phono level (like from a turntable) the only signals that really need their own preamps?

Posted

Your synths should be line level and therefore straightforward to mix using a compact mixer like the A&H above.  Phono needs its own pre-amp because the pre-amp re-equalizes the signal coming out of the turntable so it is back to a flat response (not really perfect, but that's the theory).  Mic just needs lots more gain, depending on the type of microphone.  Instrument level tends to be a little hotter than mic level.  Any mixer worth salt will have a range of gain that should accommodate mic, instrument, and line levels.

Instruments may have to have specialized input impedance switching too, but that's another story.

Find a cheap mixer from A&H, Mackie, Yamaha, etc., and you should be fine.

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