CREATE TABLE table_34443 ("Model" TEXT, "Release Date" FLOAT, "Price" TEXT, "MIDI Inputs/Outputs" TEXT, "Sampling Rate" TEXT, "Sampling Memory/Upgrade-able" TEXT, "Sampling Time" TEXT, "Storage Method" TEXT, "Pad Banks" FLOAT)

Around what time frame release a Sampling Rate of 12-bit 40khz?
SELECT SUM("Release Date") FROM table_34443 WHERE "Sampling Rate" = '12-bit 40khz'
SELECT SUM("Release Date") FROM "table_34443" WHERE "Sampling Rate" = '12-bit 40khz'