Doorbell extension wiring

I'm really confused on this ... and it should not be that difficult :)
I have a doorbell/chime in the main part of the house. It is wired from the front and back buttons with a transformer in the middle:
Button1 ---> Chime <--- Button2
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Transformer
I thought that I could just wire a buzzer into the system at the transformer. So, it now looks like:
Button1 ---> Chime <--- Button2
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----- Buzzer
-----
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Transformer
Results are far from satisfactory. Pressing the backdoor button gives a buzz, no chime; pressing the front button gives a buzz and the 2nd part of the chime (dong, no ding).
I have replaced the 10v transformer with a 10/16/24 and tried it on different voltages with no joy.
So, I have to assume that to do this I need to connect the buzzer wires at the chime end? Please tell me it's not so ... that makes a moderate job into a huge one.
Oh, I have tried the wireless option. It almost works ... problem is that the extension is outside on the deck and there are too many wall inbetween. Sometimes it works and sometimes it doesn't.
Thanks.
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mellobob

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