When I say "Port A" equate that in your mind to the thing shown in the Sonar Preferences, under MIDI Devices that say (on right hand side) under "inputs":

"n-MIDISPORT 2X2 in A"

And under "outputs"

"n-MIDISPORT 2X2 out A"

A PORT has BOTH an input and an output. And each port handles/contains 16 MIDI channels), [don't worry about the "n" n is probably 1 or 2 on your PC - it's immaterial for this discussion]

MIDI Sport B (aka Port B) would have/contain/carry a different set of 16 MIDI channels.

http://www.noterepeat.com/articles/how-to/213-midi-basics-common-terms-explained#A


Don’t let above link confuse you the USB cable to your PC from the MIDI Sport is LOGICALLY acting like 4 separate 5-pin MIDI cables:

2 input cables (one is A and one is B) and

2 output cables (one is A and one is B)

and these logical USB to/from PC paths match the actual physical 5-pin cable connection paths ON the MIDISport going to & from your actual MIDI hardware.


ONE FINAL NOTE:

While SOANR and other DAW software allows for MULTIPLE MIDI "ports" - with BIAB you can only USE ONE.

You are limited to ONE set of 16 channels (one port), period. So if you wanted to use BOTH the Ketron and JV-1010 with BIAB at the SAME time you will have to change your connections and go:

- From MIDI Sport out A (as example only, you could use B) to SD2 MIDI input then from SD 2 MIDI THUR to the JV-1010 MIDI IN (but whatever is on any given MIDI channel will be seen and reacted to by BOTH the SD2 and JV-1010), or

- from MIDI Sport out A (as example only, you could use B) to JV-1010 MIDI input then from JV-1010 MIDI THUR or MIDI OUT (and realize that MIDI THUR functions different than MIDI OUT) to the SD-2 MIDI IN (but again whatever is on any given MIDI channel will be seen and reacted to by BOTH the SD2 and JV-1010), or

MIDI thru mirrors the input (100% of what comes in goes right back out the THUR plug unaffected);

MIDI out takes the MIDI in and then it can filter, limit, block, and or change internally by the synth before going out the MIDI out

good luck
Lary

Win10Pro,i9,64GB,2TBSSD+20TBHDDs,1080TI,BIAB'24,Scarlett18i8,Montage7,Fusion 8HD,QS8,Integra7,XV5080,QSR,SC-8850,SPLAT,FL21&others,Komp.14,IK suite&others, just a guitar player-AXE FX III &FM9T, FishmanTP, MIDIGuitar2, GK2/3'sw/GI20