Yes, Bill, all my comments about the "little Pi" were referring to the Pi-Zero, actually the first and only Pi I have ever had. I gather it runs at about the same or slightly faster than the original Pi, so I think the LinPSK program would work there. That program has no issues on the Pi-zero. As I recall,the Pi-4 is something like 10 or 20 times faster and it is commonly used for decoding FT(x) stuff, but WSJT-X is still a bit marginal on the Pi-zero. I have slowly got it within 4 seconds of finishing decodes before the next cycle (I think it was like 20 seconds behind when I started), and that is with a 10% boost in the clock speed. Still, it may be good enough for my occasional use of that mode. I have made a number of contacts that way.
I like PSK-31 much more as you actually learn something from each contact and have the opportunity to have a conversation. Fldigi, which many have running on Pi-3 and 4 versions, just was too much for the Pi-zero and it would just lock up. I have toyed with the thought of trying it again with some of the speed improvements I made to run WSJT-X, but LinPSK works very well, so I will probably stick with it. If you look at ADD/REMOVE programs in the Pi menu, v 1.3.5 is what comes up, I think, but the author has upgraded to 1.3.7 to fix some of the logging issues I reported when I started using it. There are a few other minor issues right now and we are still in email conversations about them, but I have had many nice QSOs running with just a Kindle Fire tablet connected via WiFi to the Pi-zero attached to the uBitX, which works even out in the boondocks as the Pi-zero can automatically become a WiFi hotspot if it doesn't log on to a system.
=Vic=
Vic WA4THR