https://www.amazon.com/gp/product/B073HPD5TC/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1

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I got this. My wammy doesn't work, but no idea if that's cause of the guitar itself or the adapter.

This controller is junk but I believe it is the cheapest way to get a USB adapter. It worked for me via Windows Retroarch so I would imagine it would work for retropie as well.



https://www.amazon.com/EMiO-Edge-Gamepad-SNES-Mini-nintendo/dp/B073HPD5TC

All you need is the cable that comes with this controller

https://www.amazon.com/dp/B073HPD5TC/ref=cm_sw_r_cp_awdo_t1_zG.QCbC7QHP0C

Here's a way around it, buy this and make it wired :)

Everything's FINALLY arrived. Had my Wiitar for weeks now, but unfortunately I couldn't use it until the adapter arrived.

Ordering the adapter was a hassle and a half. Placing the order was super easy, but Amazon decided to cancel shipping after a few days and not inform me of it. I checked my Amazon account a couple of days before delivery was due and found that the package had been returned to sender without my authorisation.

For a domestic package I wouldn't have minded, as it would only add maybe one or two days to the whole process of getting a product from Amazon, but I'd been waiting over a week now for the adapter to come and I wasn't having it. I contacted Amazon customer support to find out what happened, but from their end, the package was still coming to me. I was escalated to another customer support rep, who told me that the only option was to refund the cost of the adapter and to buy a new one. Great. I asked them what had happened and she did some checking and then came back and told me that actually, I couldn't have a refund, and that I'd have to wait several more days to see if the package actually arrives. Fucking fantastic.

I pressed and managed to get the refund after talking to customer support for over an hour. I tried to get them to compensate me by upgrading the shipping for free (literally 3 quid) so I wouldn't have to wait over a week again as a result of Amazon's mistake. This was when the customer support rep started getting rude and cutting me off, and ultimately terminated the session. Never had that happen on UK Amazon... (And no, the original product never did arrive).

Anyway, I got my refund, and was very happy to find that the seller of the adapter on Amazon had discounted the product, so I ended up paying roughly the same price that I originally paid but with upgraded shipping this time. Still an utter waste of time and money, but hey, Amazon does that sometimes.

The adapter finally arrived today. Forgot to mention: also had to order a USB extension cable off their Amazon Basics line. Got the 3m one - seems decent enough quality.

Total cost?

• Got a REALLY solid deal on a new in-box Wii Les Paul on eBay - £0.99 plus an extortionate postage charge of £6.99, so £7.98 all in all for a pristine Wii guitar. Not bad at all (usually the new ones go for about £30 - not sure why no one bought this one, cos it's definitely not a fake).
  
• Bought this female to male USB 2.0 extension cable for £4.47. 3m, so it's long enough that you can plug it into your PC and move around with it or whatever. Can't complain about this at all. I have use for this anyway, as my current USB cables don't stretch far enough when I game with my PS4 controller just in general. Could've bought a longer USB cable, but I can kill two birds with one stone with this.
  
• The adapter... Amazon tells me that I spent a grand total of £24.01 on this. The controller is garbage and not worth using, but the cable works well. If you don't buy the upgraded shipping, you'll probably spend around £20 instead. I'm hoping that Amazon refunds me the import charges, as by UK law the product isn't eligible for any import charges due to the price.
  
  

  Total cost: £36.46.
  

  With Raphnet adapter, it would have cost (including imports etc): £48.10
  

  
  Lesson learned: just buy a fucking Raphnet adapter. I saved 12 quid lol. Admittedly, I overpaid for shipping, and I'll probably get import fees refunded, which would bring the cost down to about £29 if you were to do this. And you probably wouldn't have the same hassle that I had with the Amazon adapter. All in all, though, the adapter works, and I've got a sweet, sweet Wiitar to play, so I'm not really that disappointed (assuming the adapter doesn't crap out on me...)
  
  If you can afford to spend maybe an extra £20 for the Raphnet, just do it. It's really not worth the hassle trying to get a good deal. In the future, though, if I ever need a new guitar, I don't have to worry about buying another bloody adapter - I can just buy another Wiitar off eBay, and hopefully for cheap.
  
  £37 is also almost exactly how much I spent on my new in-box Xplorer, so make of that what you will. I'm not sure if Xplorers have gotten any more expensive since I bought mine. I can't really give any impressions on how the Wiitar compares to my Xplorer, either, as I've only set up the guitar and made sure everything works at the moment. I've not done any proper playing. I can tell you that the Xplorer was very awkward to play due to the shape of the body, so I had to do this weird leg cross over thing to get it to sit nicely on my legs when sitting in my chair. It seems like that's the main complaint people have with the Xplorer, and I've seen Randy do almost the exact same leg cross over thing to get his Xplorer to sit properly on his lap. Also, I ended up with a gen 1 Xplorer which apparently had crappy frets. Mine did, so I messed with the fret pad (the slit mod where you slit the sides of each fret) and got them playing excellently, but unfortunately I overcut and they only lasted a few months before blue and orange started occasionally sticking under the slits I cut - hence why I'm buying a new guitar.
  
  Oh, almost forgot: I haven't figured out how to get whammy to work yet, but this is also a problem with the Raphnet adapters. I probably just need a tutorial.

This is the cheapest adapter I could find: https://www.amazon.com/ELECOM-converter-Classic-controller-JC-W01UWH

It might be worth it to get this instead: https://www.amazon.com/EMiO-Edge-Gamepad-SNES-Mini-nintendo/dp/B073HPD5TC

I had a wiitar and i found this cheaper alternative for the raphnet adapter that has worked fine for me. it’s a $15 SNES usb remote that comes with the dongle you need for wiitar to usb. it has worked fine for me. it is short though so you would need a usb extension cord thing.

I unintentionally found a way to use my two wireless wii guitars with USB just today.

I bought this SNES controller at a nearby mall. It's for the SNES Mini but comes with a USB adapter for PC. The adapter so happens to be perfectly compatible with the Les Paul. It works flawlessly. Input lag is the same as my Xplorer, and it worked first try. The only thing I needed was a USB extension.

20$ for a semi-crap SNES controller and an adapter for most Wii controllers. I'm considering buying another one.

EMiO Edge Gamepad for SNES Mini - Super NES https://www.amazon.com/dp/B073HPD5TC/ref=cm_sw_r_cp_apa_i_KNAsDbNR9G9FK