Connecting PSR i455 with SX 900

[Sukanta]

Dear all respected members,
Recently I'm using SX900 with my old i455. Is there any way to connect i455 with sx900 so that if I play a string voice from i455 that will come to sx900 and I can record it in sx900 during performance? Please help.

[mixermixer]

Only thing I can think of is using either the AUX in or the MIC in from the stereo out of the i455.