I am now VERY happy with the B4. I upgraded it at the Native Instruments site and MANY important functions can now be triggered with the computer keyboard. The spacebar, for instance, toggles F/S rotor speed.

Part of my computer upgrading was a MS 'internet' keyboard. Well, that keyboard has -/+ VOLUME control buttons, so I can now lower the sound-card volume from the computer keyboard (very nice).

In the 740, I set R1 to ORGAN FLUTES and lower the flutes to zero, effectively obtaining a SILENT VOICE (credit to Dr. Simon at PK forum). So now I can use autoac of the 740 piped INTO the computer, and the foot volume in control the SILENT voice.

In the B40, the modulation wheel toggles f/s rotor speed also.

The REGISTRATION buttons are recognized by the B4 but I am stil working on other things before I figure what the B4 wants and whether or not the PSR can send it, else I'll get a Peavy or something.

I find that MIDI cables, sound cables,MODEM, MONITOR, speaker cables, mouse, keyboard, printer, TV antenna, scussi scanner, mic, etc. are TOO MANY in 8"SQUARE, and a loose cable can cause noise at higher volume levels. So I am gradually going into universal bus which can now connect many MIDI ports and most newer pc stuff.

To me, the PSR-740 organ voices sound like TOY voices (through the same sound card and speakers), compared to the B4 sounds!