The connection on your Alesis is a USB connection, meant to connect to a computer (a USB Host). But the 3.5mm connection on the iRig is a MIDI connection, not USB. So you cannot connect the devices that way, even if you had a cable to do so.
If you connect the iRig and the V61 to your computer (via USB) you can use the MIDI routing in your computer to connect the V61 with whatever MIDI device is connected to the iRig.
If you do not want to use a computer, products such as the iConnectMIDI2+ can act as a USB host.
THE MIDI ASSOCIATION (TMA)
The community of people who work, play and create with MIDI