Software-Controlled Tuning with Flex 6300 and Icom AH-740

W4OGP

I'm using an Icom AH-740 with a Flex 6300 in my Jeep. Currently, I press the TUNE button in SmartSDR or on the Maestro, and then manually press a button I rigged up to initiate tuning on the AH-740. This works well, but I'd prefer to trigger the tuner directly from the software, eliminating the external manual step. I initially hoped the RCA output could be configured for this purpose, but unfortunately, it can't be set to trigger exclusively during tuning. Is there another interface or method available to accomplish this? I'm comfortable writing software for an interface if there's documentation available. Thanks!