A vintage AD-9 is the best 300ms analog delay I’ve heard. I had a vintage DM-2 with the MN3005 chip and the AD-9 just had a bounce and character to it that couldn’t be coaxed out of the DM-2. I have probably more delays than I need. Big box DMM modded by Analogman for 850ms delay with 4 MN3005 chips. Vintage AD-9 Walrus ARP-87 Empress Tape Echo Boss DD-3 with the long chip But they each do something that none of the others can do.