Turns out this was not the manual i was looking for. The concertmate 670 keyboard i have is a "Realistic" model made for Radio Shack and none of the diagrams on the owners manual i received matches up. HOWEVER, I must say the service Owners Manual provides was fast and efficient by being available online. The manual was in good readable condition and easily downloaded.
Thank you for your manual It has the basic things to and i use the Oszi for Longer Time.
THX
Text excerpt from page 13 (click to view)
4. Plugging in an Acoustic Guitar, Stereo Keyboard or CD Player
The GigRac will happily receive signals from instruments with either mono or stereo outputs such as guitars (Mono) or stereo keyboards and CD Players (Stereo). Before plugging in, make sure the Main Volume control (6) for the chosen channel is turned fully off to avoid accidental damage to your speakers. Acoustic Guitars Set the Main Master Volume control (1) to about halfway. Make sure the Main Volume control (6) on the channel you are about to use is turned fully down. Plug the guitar lead into the jack socket in the center of the combination input socket (5) on the channel of your choice. Turn up the volume control on your guitar to about halfway, and then gradually turn up the Main Volume control (6) until you hear the guitar signal appearing in the loudspeakers.You should also see activiity on the Main Output meter (7). Stereo Keyboards and CD Players The GigRac offers four channels that can receive stereo inputs. Two of these channels are equipped with RCA/Phono connectors (Channel 5 and 6) (12) and two with Jack connectors (Channels 7 and 8) (13). Connect up the Left and Right outputs of your CD player or Cassette deck to the Left and Right RCA/Phono inputs on either Channel 5 or 6 of the GigRac. Turn up the Main Master Volume control (1) to about halfway, and then turn up the Main Volume control (6) on the chosen channel until you hear the signal appearing in the loudspeakers. Connect up the Left and Right outputs of your Stereo Keyboard to the Left and Right Jack inputs on either Channel 7 or 8 of the GigRac. Set the volume control of your keyboard to about halfway. Turn up the Main Master Volume control (1) to about halfway, and then turn up the Main Volume control (6) on the chosen channel until you hear the signal appearing in the loudspeakers. You may now use the Treble, Mid and Bass controls as mentioned above to change the tone of the signals.
