How to boost audio volume coming from a telephone
Foreword: If you don't know the answer, don't leave. Write your idea where I could find an answer to this as a comment.
I want to connect my telephone to my computer's sound card. I want to connect my headset to my computer's line-in with a mic preamplifier in between. I want to hear my partner on the phone and talk to him using my cable headset connected to my computer.
The reason for me to connect my computer's sound card to my phone is that I want to include music samples into my voice channel so my partner I am talking to via phone can hear my voice aswell as music samples generated by my computer.
How would you do that. Be as precise as possible.
What kind of phone? This landline cable-bound phone.
Something like that
What have you tried?
A lot. I won't share it to avoid influencing the ideas.