By using the optional Audio Input Module Order code CT7) and the Audio output Module(U Order code CTB), we can use voice signals as the audio modulating signal instead of the ANACOM 2's Audio oscillator. If you have these modules, make the same connections as in Practical Exercise 8.4 When you have finished, switch off the power supply and disconnect from the Audio Input and Audio Output modules Except for the power supply comections, remove all the other connections from the ANACOM 2 board