Dear Reader: Without knowing which model of behind-the-ear instrument you're wearing or the type of transcription technology you're using, I can only reply in general terms.
There are actually at least three potential routes for signal input into advanced BTE devices from equipment like you're using for transcription:
- Induction (tele)coil for electromagnetic signals (difficult to set up)
- FM or other signal inputs via hard wire or boot attachment (most effective)
- Acoustic signal through standard microphone (least effective)
Although there are a number of resources that can help you with accessing these input technologies, I'm providing you a link to one excellent source of help at www.beyondhearingaids.com/.
In addition, you will need to work with your audiologist or hearing instrument specialist in coordinating any effort to equip your hearing aids so that you may enjoy direct inputs from your transcription equipment into your hearing aids. The more direct the input, the clearer the signal without distortion or feedback. In cases of confidentiality or privacy nothing is better than direct audio input.