Guidelines
Please give some thought to as many of the following points as you can beforehand:
You might want to provide a clear chart/lead sheet (preferably a PDF), complete with any specific instructions or requirements you may have.
You might also let me know if you have any specific style or player in mind.
Although one track is entirely fine, you can prepare two tracks (and MP3s will do);
(i) one without the flute part(s); and
(ii) another with any specific flute part(s) roughed in (even if just casually with a midi/synth).
Include some lead time (for example, a 2-bar click or a count-in) at the beginning of your track(s) so we can be sure to line up with each other.
Checklist
(1) – a chart or lead sheet
(2) – one, or perhaps two, audio file(s) (and if two, then one without the flute part, and one with the flute part roughed in)
(3) – any stylistic suggestions and/or specific instructions; for example, “Play some obligatos under the lead vocal starting halfway through the 1st chorus, play a solo on the 2nd chorus, and then play some fills on the way out.” Or simply, "...Blow over the entire track!..."
(4) – any additional details, such as when you require the track(s), and/or any specific format (usually WAV), and/or file transfer preferences (usually WeTransfer)
(5) – a means of payment (e-Transfer or PayPal)
(6) – whether or not you require an invoice (and if so, to whom it should be issued)
Please note that payment is due upon approval of any reference MP3 file(s), and prior to delivery of the final WAV file(s).
Technical Stuff
The flute track files I provide to you will be in mono, 24-bit, 44.1kHz, WAV format which is the most common format for mixing and mastering.
The flute sound will be flat and unprocessed so that you can EQ, pan, and/or process it in any way you like.
However, if you want a straight, acoustic flute sound, then make sure to add a touch of reverb (or "room") to the raw flute track to give it a more realistic ambience; i.e., to keep the sound from being "dry" and “in-your-face”. Doing this will also enable the flute sound to blend more effectively with the other sonorities.
...One last thing!...If you are working in a 96kHz recording environment, you can easily convert 44.1kHz files to 96kHz, for free, online, at the following website:
https://onlineaudioconverter.com