I agree with all the Deep Blue suggestions. It’s excellent.
I made an Fv-1 approximation of the Deep blue delay circuit. The actual repeats are handled in digital, but all the surrounding circuitry that imparts the EQ/tone follows the deep blue circuit. The main benefit for your use case would be long delay times (~1sec) with no degradation. I included the modulation knob which was one of my main goals for the project.
I could probably send you a pcb if interested, but it’s set up for 1590B side jacks.
I finished up a pedal that I’m pretty excited about. It's a FV-1 implementation of the Mad Professor Deep Blue Delay, where the FV-1 handles the delay time and modulation, but the filtering is analog circuitry around the FV-1.
The DBD clone was the first build I attempted, first try (on vero) went in the trash but the second try worked great. At the time, I had read a lot of great things about it and I still do really like the tone of the repeats, which filters both high and low frequencies. It's been my favorite sounding delay circuit, and I'd encourage anyone to build it as is.
I wasn’t aware of that issue- I have no idea. I’ve only built one Seabed before for my bass player, and he hasn’t experienced an issue with it. I did a quick search on this forum, but so far only found mention of lockup in a 2399 chorus Chuck experimented with.
I won’t judge you for it! I still have yet to build a pedal with side jacks. There’s several Madbean projects I’d like to build that are designed with side jacks. I tried fighting one of the layouts, but I think I’m ready to give in and give it a chance.