Or...rather than use a text editor or word processor, use a DTP program such as Adobe PageMaker. You can leave a space or three in the text line then drop in the symbols as separate text blocks, using whatever font size looks right - no problems with the leading then. Put them on a separate layer if required. This is what I've been doing with a violin tutor book for French children (no, I'm not writing it, just designing!). I use the TT font 'Musical Symbols' but can't remember where I got it - if you'd like it send me a personal message with your email address.
Jo Taylor