Thanks Tomasz, much appreciated.
Absolutely, it’s been a while and I see no reason that you shouldn’t add another. I’d follow a similar guide to AVOYP and not flood the challenge with your own, so keep that in mind. If you add another then please tag me so I can update the first post.
@DavidP: Well, here I am with another one; based on a bluesy D9 chord (D9 dominant with a minor 7, not a DMaj9). BT consists of a drum computer and two guitar lines, then comes a solo over it. I tried to do my best to make it completely different to the first one in style and mood.
No worries though, I’m not going to spam this topic 
That sounded pretty good, Tomasz.
Doesn’t seem like the challenge is picking up too much attention (yours was the only comment mine received). So posting a new one every few weeks will be fine.
OK, David, thank you! I’ll think of something still different, maybe I’ll try to solo over a really weird chord…
I did a vamp/improve over a G7 chord back during the pandemic:
@CT: Thanks for posting your improvisation. The backing track is great, too. The G7 chord plus your use of a pentatonic give a bluesy character to the whole recording. Nice! 
Sigh… just another of my under appreciated tracks. LOL
Not exactly pentatonic. In the G major scale there is a “canal” (AKA canale) at the 6th fret. I basically danced around the notes framing the canale – mostly 5th and & 7th frets with bends, slides, etc. No wrong notes and plenty of areas to develop some phrasing.
Dom 7th chords are a lot of fun to vamp over.
Nice and cruisy Tomasz. Enjoyed that one. Has reminded me to get back here and post something.
Cheers, Shane
Clint
Good display of so many variations around a simple backing track: had a really good groove and felt jazzy in passages. Well played.
Brian
Nice one Clint. Good to hear from you again. I was starting to wonder where you were.
Cheers, Shane
Thanks for checking up! I’m around and hoping to ramp up my musical explorations again. 
@CT Nice one CLint, been awhile. Glad you joined me in supporting this challenge with an upload. That canal is interesting, never noticed that.
Thanks DP!
What’s cool about that “zone” is that the right note is a slight bend or slide away from the wrong note.
Like all (or most) things on the fretboard, the patterns are movable. The Canale is at the 8th fret for A major.
@DavidP: We have another contribution to the ‘Vamps’ by CT; if you could please add a link to the first post… Thank you in advance
Apologies, Tomasz, I saw, listened, and forgot to update the header. Taken care of it now.
Thank you, David, no need to apologise. Also, I didn’t mean to prompt you in any way; just thought you might have missed the new entry.
Here’s a ‘One Chord Vamp’ over C Major, done tonight. I use these vamps alot to practice new stuff, and help develop existing learning. This one is typical of one of those, where here I’m working on switching major/minor pentatonics, using triad shapes, and practicing doublestops/dyads.
@DavidP
Cheers, Shane
Double-stops were especially tasty. Well done.
Yep, loved the double stops, too. Good volume balance; I sometimes overdo with the BT…
Shane
Very good lead lines and some clever picking, very tidy too, and bang on timing with the backing track. Well played!
Brian