So maybe EHX are the best placed to bring out a series of power supply packs for EHX pedals after all.

It is true that when one puts two EHX pedals together the result is not 2 but 3+ to infinity. So synth sounds are never far way. The question is, John J, polyphonic shift change or mono? Boss make a good octave pedal, and if you can get hold of a vintage EHX Deluxe Octave Multiplexer it has good tracking sub-octave performance and also an integrated muff fuzz.
The drop tune pedal concept is still really interesting. Gerard Lhomme, a sound engineer I work with in Brittany, France, is looking for a one-pedal solution for the studio Fender Rhodes for solo chorusing in mid scale on the keyboard. The best solution we found so far involved three pedals linked together. Then I suggested the POG and his answer was that in that sound direction he already had his Eventide ( ****!!). Well, he is a sound engineer.
The point is, a Drop Tune Pedal should deliver the goods, meaning a semi-tone come tone change etc of the signal fed to it, be that natural or with prior effects…and polyphonic. I still reckon this should be possible while avoiding the “synth” colouring John J. describes.

Some people describe it as psychedelic blues ( what’s that?), progressive jazz or heavy trance. Whenever asked the question I basically have no idea what to say. Influences? Thelonious Monk, Cecil Taylor, John Coltrane, John Lee Hooker, Lightnin’ Hopkins, Indian Raga, Mahler and Arabic music, with a strong touch of Celtic in there somewhere.

So I was about to go for a vintage Graphic Fuzz but ordered a Voice Box instead. Now the next on the list will be the Holy Stain. In the meantime I am refurbishing my vintage pedals. So far I have managed to successfully repair/trim my two vintage Deluxe Octave Multiplexers, an original vintage Electric Mistress and a vintage Deluxe Electric Mistress, got one of my Deluxe Big Muffs repaired, and a really beaten up Deluxe Memory Man is being repaired right now. After that I will be undertaking the rescue of a vintage Clone Theory and also a vintage Hot Tubes.
There are a few more to go after that…so I have started saving up to get all the old vintage pedals in good shape before venturing out again. Unless, of course, I come across a Talking Pedal….

… brilliant…what a knock-out!!

Here is a brief selection of the sort of reel-to-reel tape recorders you can find either on eBay or in pawn shops. You take a given length of magnetic tape, splice it together (thin transparent Sellotape and a sharp razor blade on a non-metal support surface using a diagonal cut should do the trick), then you place your tape loop on to the empty reels, left and right, put the tape machine into record, link the playback RCA cinch connections to your amp or mixing table by using an RCA cinch > telephone jack lead, start the recording and then start playing, the tape loop will record what you are playing and then put it out through the playback tape heads and voilà! tape echo.
You change the speed of the tape recorder as you wish, change the length of your tape loops and you can also link two tape recording machines in series, first left reel to the second right reel, and experiment with distance between them, with great results.
One reggae album I produced featured two Revox reel-to-reel tape recorders with a distance of four and a half feet between them and a tape loop crossing the control cabin. This produced some great echo/sound-on-sound drums and vocals, with one incisive guitar chop which would appear in the mix, then disappear only to re-emerge at certain moments. If set up correctly, the double tape recorder system gives you a double stereo echo with great variations.
The reel-to-reel tape recorders featured in the selection below are:-

Akai GX 215D
Philips N4520-High End
Revox B 77 MKII Stereo
Revox B 77
Revox Type A 77 MKII
Sony TC 252 Stereo
Sony TC-755
Teac X-300

This is a small selection of what is out there and up for grabs. I do not recommend Uher, by the way. Good recorders but no good for echo.
The best by far, as used by many musicians in the past and present, are the Revox B77 Mk II and/or the Revox A77 Mk II. Tascam / Teac are also good but you have to make sure that the model you are looking at is not a super hi-fi automatic tape reverse model. They are useless for echo. However the big Teac and Tascam 2 Track Stereo Master Recorders are great.
Last but not least is the Teac 3440 reel-to-reel 4 Track Sync Recorder (not pictured here) which is the nec plus ultra!
It allows you to record on 4 sync tracks separately, with mixdown from two or three tracks to two or one track as you wish. You can imagine that with a tape loop this offers a load of possibilities.

…..and if you are still reading this you must be hooked on the idea…and a reel-to-reel tape recorder as featured in the picture below costs between 50 and 600 USD, so you have a wide choice to fit your budget.