Amplitude modulation with adjustable sidebands.

I have an amplitude modulated 'tone'(signal frequency) at 428 Hz and a carrier frequency of 104 Hz. I would like to adjust the immediate sidebands of the signal frequency so the the sidebands are at +/-110Hz (others remain 104) from the signal frequency - (i.e. so the sidebands are slightly further away from the signal frequency). I also need to be able to adjust the amplitude separately of these two sidebands as a percentage of the signal frequency amplitude. Finally, I need to plot an fft of the signal frequency with the two sidebands. Any help is appreciated.

Note: The signal frequency and the carrier frequency have inputs for amplitude, frequency, and phase.