Simulink C5505 ECG

hi,

I have C5505 EVM, and I am doing ECG implementation on it. So far I have 
successfully got the results of ECGs. Now I am trying to interface the 
Kit with the Matlab/Simulink. i achieved signals Simulink using 
Instrument Toolbox in simulink but the output is all noisy. i also have 
to differentiate between ecg leads signals for further analysis. Please 
if anyone can advice me on this...

Talha.