Connecting synth output to Angela Line-In // Volume Problem

[Frcake]

Hey guys,

When i try to connect my jupiter 6 to Angela's input from the jackfield , i get a very thin sound , and the line amp barely boosts when he's all up!

For some reason i hook up a TR-606 on another input and plays fine, but when i plug the jupiter(even in the same cable) it's really thin , no bass, no volume!

Also i had the same problem when i plugged an ELKA orghan , same thin low sound.

To be sure of the jupiters good working state, i hooked it up to a monitor alone and played fine, same output same cable etc...

Is there a problem with Angelas impedance?, And if this is not do-able, how do you go about recording a line signal from the control room?!