Those DIN MIDI to 3.5mm MIDI cables and adapters will not produce the kind of clock signals needed in Eurorack. They just convert between different physical plug formats. I think Lugia's suggestion of the Ladik M-221 is the most inexpensive solution. Pam's is a nice module but it needs 24 ppqn to sync (lower ppqn is possible but not recommended) and the Tascam 12 doesn't provide that.