Bigguy2017

That sounds like something going into oscillation. Most likely; dry joint/bad connection bad decoupling capacitors op-amp or transistor faulty faulty bright switch Have a really good look at the PCB, check the soldering, look for leaky/bulging caps. Unplug/replug all the connections, give them a squirt of Deoxit. Give all the wiring/connectors a wiggle to see if you can localise the problem. https://www.flyguitars.com/gibson/bass/RDartist_techinfo.php https://www.flyguitars.com/gibson/bass/RDartist_circuit_diagram.php That's a beast of a circuit diagram...

It does depend on your playing style (light, diggin' in, pick, finger), your bass (output level, tone) and what you want sound like (clean, grungy, fuzzy, vintage motown). Also how loud the rest of the band are... The Fender Rumble and TC BG250-112 will get you clean and motown and also dirty (Fender has a drive knob, tc has Toneprints) . Volume wise they both will work live but the tc will struggle in a loud band and likes a second cab. Bottom line is what you like not what I like ! 😉

Fender Rumble or TC Electronic BG250-112. It's best to try them with your bass, but CoViD will make this tricky...

Should not matter. You could rotate the pickup a tad like a telecaster.

1. Yes. Both op-amps are shown unity gain so one might need an input resistor (Rin) on pin5 and a resistor (Rf) in the neg feedback loop (pin 2) to match the levels with differing pickups. Gain = Rf / Rin 2. If vol pots were before the op-amps then no, as U1 is acting as a buffer.

I'm in Leith so it's not me...

Hmmm.... shouldn't happen like that. Could be the nut is completely slacked off and not threaded on the truss rod - that would allow it to slide out. Press / tap it back in and then get an allen key and tighten (CW) until you feel it tighten. Take a look along the neck for straightness / relief.

Is that an Epiphone Masterbilt Century De Luxe 4-String acoustic/electric Bass?

I have fixed a few scratchy pots with a mix of 80% isopropyl alcohol and 20% WD40. Mix it up in a plastic bottle with a pointy spout top. Cleans and lubes. Worth a try when you're probably going to have to replace the pot anyway. ;-) Caig Deoxit is the best but pricey and was not always available - Amazon stock it now...

I generally buy second hand instruments, for the better value. This can be 'blind' online, or after a hands-on examination. I bought my first MM Stingray new in 1980 in (Buzz Music Hereford after they couldn't deliver my ordered black Precision). I have bought new 'blind' off the web (2019 MIM telecaster) which was a great deal. Gibsons need to be examined before purchase as there are many potential problems. Quality of new kit, even the cheaper stuff is much improved from when I first started playing... back then most affordable basses were crap.

And Neutrik connectors can be re-used; many times if your soldering is tidy. I do a lot of AV installs which start with rip-outs, so I have a ready supply of second hand jacks and XLRs. I have about half a bucket full... great when you need to bodge a cable together in a hurry...

Sommer The Spirit XXL cable - the smokey grey stuff. Neutrik jacks - black ideally, one straight, one right angled. Make it up yourself or use designacable or custom-lynx on eBay

I've heard of tape wounds; is this a way to make your own crappy😁 Elixir copies?

That's like the Martin truss rod tool with a slight bend at the end... What size is it? StewMac have similar... https://www.stewmac.com/Luthier_Tools/Types_of_Tools/Wrenches/Soundhole_Truss_Rod_Wrenches.html Chinese generic 4mm or 5mm https://imall.com/product/Guitar-Bass-Neck-Bridge-Screw-Truss-Rod-Long-Wrench-4-5mm-Hexagonal-Adjustment-Spanner-Repair-Tool-D40/aliexpress.com/4000624298803/568-39530305/en https://www.ebay.com/itm/Ball-End-Guitar-Truss-Rod-Adjustment-Wrench-Tool-for-Martin-Acoustic-Guitar-4mm-/292817127501

Meh, that's not a Mustang. Two pickups and the wrong bridge. I could go a JMJ though... 🙂

Sounds like some high speed motor boating is going on. One of the op-amps oscillating? Suggests decoupling caps are faulty (or op-amp is blown). Check the soldering for dry joints (big cap bottom left corner in the underside looks a bit blobby). Gently wiggle the cables... any crackles? Lift one leg on the caps (green ones and electrolytics) and put a cap tester on them. Otherwise you need a 'scope and follow a signal through.

But you didn't level them...

That looks like the one .pdf drawing here https://www.neutrik.co.uk/media/8513/download/nlj2md-h.pdf?v=1

Something is obviously vibrating, but what, where and why... If only certain notes it sounds like a resonance thing. Are the troublesome notes harmonics; does the octave of the nota also buzz? Is it volume related? If you have another amp, can you connect that to the suspect speaker? Can you plug the Frontman's amp into another speaker cab? This should isolate the problem. Possibilities; Something loose / foreign body in the speaker. Check the speaker spade connectors, bridge wires, surround and cone for splits, anything stuck to magnet, plectrum in speaker (!). Mechanical noise - something loose is rattling. Dry joint in the amp + cabinet resonance. Dirty pot or jack socket + cabinet resonance. Can't think of anything else...

Excellent series, well worth watching. Beautiful to look at and great music choices throughout.

2004 Les Paul Standard for humbuckers 2019 MIM Tele for single coils Ovation 1993 Elite for acoustic...

Audiomovers will stream from a DAW to a browser at very low latency https://audiomovers.com/

Yes, pretty much. Big brother was the guitarist and a friend played violin so I got bass...

My 2012 Ric 4003 has the narrower inlays

Have a look at https://audiomovers.com/ It's a super-low latency plugin for your DAW, which streams audio into remote browsers. My brother has been using it for teaching and it works as advertised. Can be used in parallel with Skype or Zoom. AAX, AU, VST, VST3 OS X (64 bit only) Pro Tools 12,2019,2020 Cubase 9.5-10.5, LogicPro X, Ableton Live 9.5/10 Windows Pro Tools 12,2019,2020 Cubase 9.5-10.5, Ableton Live 9.5/10