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I have a USB MIDI keyboard which is totally useless when not plugged in into a PC and playing a digital instrument. Is there a cheap way, for example some type of box which has predefined sounds, synthesizers, pianos etc on it and a box integrated or 3.5mm out?

Sometimes I would just like to jam a bit like I used to with my old Yamaha keyboard without powering up the PC.

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Firstly, does your USB keyboard have MIDI out (DIN) sockets as well... enter image description here ...or is it USB only?

If it is USB only, then it is possible to get a hardware converter (from USB to traditional 'DIN' MIDI) that should work as long as the USB Midi keyboard is 'class compliant'. an example is http://www.kentonuk.com/products/items/utilities/usb-host.shtml.

Once you have a traditional (DIN) MIDI connection, you'll be able to use any midi sound module. Many years ago, these boxes were the most usual thing to use with a midi keyboard - often with a computer-based midi sequencer in between. These modules are also sometimes called 'expanders'.

You'll want to pay attention to the type you get. Many modern hardware midi modules are analogue-style synthesizers that are marketed as benefitting from having physical controls, the assumption being that people will get their 'bread and butter' sounds (pianos, strings, etc.) from their computers these days. These analogue style sounds may be exactly what you want, but even so you may want to be careful that you don't choose something with polyphony that is too limited for what you want to play.

It may be that looking at the second hand market will give you something closer to what you need. Some examples (purely examples, not recommendations) of older 'Sample + Synthesis' modules that should have a selection of sounds for jamming are...

The Roland JV-1080:

enter image description here

The Korg X5DR:

enter image description here

Of course when buying something that may be 20 or more years old, you'll want to consider that reliability may be an issue before laying your money down.

5

If you're willing to do it DIY, single board computers like a Raspberry Pi have enough processing oomph to act as (simple) synthesizers. They come with a USB and sound ports, it's just a matter of piecing together the midi driver and a synthesis engine software. Some examples of Pi based synthesizers can be found here.

  • Yeah I thought about that, but wasn't sure about the latency, have found conflicting information about that. Also quite some time investment :) – JustGoscha Mar 2 '16 at 12:47
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    @JustGoscha I have been using a Raspberry with my M-Audio controller with USB for some time nite and latency has not been a problem for me (I'm just a noob trying to learn to play keyboard though). I'm using Raspbian (without graphical environment) and FluidSynth. Setup requires some time but I just followed a tutorial I found on the internet (don't have the url right now...). The only "extra" thing I did was using an external USB audio output, as the built-in was not very good. – jdehesa Jan 7 '17 at 1:55
  • @jdehesa this one? – naught101 Feb 19 '18 at 5:47
  • @naught101 Honestly, I don't remember for sure, but probably, either it was that one or a very similar one, that's basically what I use. – jdehesa Feb 19 '18 at 7:39
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If you want to go really cheap, I found this little sound module on Amazon that costs only £50. Haven't tried it, but it should get the job done. Accepts both USB and MIDI as an input and in the product description states that it can power up a MIDI keyboard.

Ammoon Midiplus MiniEngine, and
Ammoon MIDIPLUS MiniEngine Pro

Ammoon Midiplus MiniEngine

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I did something just like this recently. I have an AKAI MPK Mini and an iPhone 6s and wanted to connect them. I bought this lightning to USB adapter and it works just fine with a variety of keyboard apps on my phone. With the headphone jack you can output the sound however you like. The only caveat is you can't charge the phone while the MIDI controller is plugged in, so the phone's battery might get drained pretty quick. If your MIDI controller is USB and you have a smartphone, you can likely get something similar to connect them.

1

what a false legend. since early 2016 you can get the "Lightning USB 3 Camera-Adapter" for less than 50$. With that you can charge while having connected your iPAD to any USB keyboard, USB hub or whatever USB/MIDI device you want. If the device needs more power than a few tolerated milli amperes, put an additional, powered USB hub (~ 20$) in between. But with or without such a hub, you can power/charge your iPad through the "Lightning USB 3 Camera-Adapter" while communicating with USB device(s). The only real complaint I have with IOS is, they don't offer a firewall, so every freaking APP involved in your MIDI/AUDIO chain can telephone your musical ideas (just a few kB) home and offer them as "chord/melody assistents" to the world, before you have copyrighted your own ideas. So use Apple/IOS/itunes products with a grain of salt. (MacOS has firewall though, just the IOS hasn't). Have fun.

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    Some parts of this answer would be better placed as a comment to the criticized answer. – guidot Jul 17 '17 at 7:48
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If you have an iPhone, you can run it through GarageBand using a USB-Lightning adapter. But it will de-charge a phone pretty quickly.

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If you have an iOS device (iPhone, iPad, iPod), you can connect your keyboard to it via Lightning to USB Camera Adapter (the new MK0W2AM/A model can charge device at the same time) and download some apps listed on this website:

iOS Keyboards Apps

You can use these apps with DAW (Digital Audio Workstation) or standalone (check app description).

Some of these apps is free:

iOS Free Keyboards Apps

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