A: The 'MIDI file to Style' convertor software is only currently compatible with the brand new Genos2 at this moment in time. This may however change in the future.
This is just utterly wrong. It isn't the first time that Yamaha customer service is flummoxed by a new product.
Here's a broad outline of how to create a voice list for the DGX-670 or any other SFF GE (SFF2) compatible arranger.
1. Download and install the style creation program.
2. Download the ZIP file with the existing voice lists and UNZIP it.
3. Open the Data List PDF for the target keyboard, e.g., DGX-670. Go to the list of voices.
4. Determine which of the existing voice list files are similar or a superset of the target keyboard. For the DGX-670, I would start with the PSR-SX900 voice list. It's easier to delete voice entries than to type in new ones.
5. Go step by step and compare the list in the text editor against the Data List PDF. Yes, this is manual and tedious.
6. Delete any entries in the voice list that are not supported on the target keyboard.
7. If the DGX-670 has something unique (i.e., VRM piano voices), create a new entry in the appropriate subcategory in the voice list.
8. Save the new voice list file under a different name. Save often just in case you need to back up after making a mistake.
Please note that some DGX-670 voices may have entries in the Legacy category in the SX900 voice list file. Copy and paste, if necessary.
Hint: Put the voice entries in the same order as they appear in the Data List PDF for the target machine. This will make it easier to proofread the new voice list against the Data List PDF.
Yes, this is a lot of monkey-work. Welcome to computer science! I did this kind of work for decades. Glad I'm retired.
Good luck. Feel free to ask questions here.
Enjoy the day -- pj