If you have a MIDI keyboard already connected to the Analog Four then you have a choice to make. Either:
[ul]
[li]Use the controls on the keyboard to control the AF, or[/li]
[li]Use a MIDI merge box to merge the MIDI signals from the keyboard and the KP3+[/li]
[/ul]
I don’t have a KP3+ or an AF, but what you will need to do in either scenario is this:
[ul]
[li]Find the number of the PERF CHANNEL for your AF[/li]
[li]Activate RECEIVE CC/NRPN on the AF[/li]
[li]Set up the Performance macro as you like on the AF[/li]
[li]Find the CC MSB number for the desired Performance macro in the PERFORMANCE CC table in Appendix D of the manual[/li]
[li]Set the controller keyboard or KP3+ to send MIDI CC messages with the CC MSB number you found in the manual, on the PERF CHANNEL channel number. (you didn’t say which keyboard you have, but the relevant instructions for the KP3+ are given on pages 20 to 22 of its manual.)[/li]
[/ul]