Some DDS synth may do the job.
some DACs to control some VCOs too.
Tons of different way. A single PIC.. maybe good for low frequency.
Do you have all frequency values? It could be possible with some effort...
EDIT: you said 6 frequency... All together or what?
Be carefull some birds are much intelligent than others...
<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=1119&stc=1&d=116054050 2">
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