I believe you are talking about audio mastering for distribution (i.e. SoundCloud or Spotify)
Personally, I use iZotope Ozone 8 Advanced mastering suite: https://www.izotope.com/en/products/ozone.html
Be sure to use good quality studio headphones or studio monitors.
Here is what I do:
MIXING
1. Use an EQ on the audio track to cut out any off frequencies, and set Compression if necessary.
2. Set my reverb (here is a good tutorial on how to do that with Pianoteq: https://www.instagram.com/p/CIHkAF7FTal/ )
MASTERING
3. Place 4 plugins on the master bus: iZotope Ozone, iZotope Tonal Balance Control (comes with Ozone Advanced), Youlean Loudness Meter (free), and Sonarworks Reference 4.
4. In Tonal Balance Control, create a custom target curve from a folder of solo piano reference masters
5. In Ozone, select the EQ, Compression, and Maximizer modules. Set the Maximizer to True Peak limiting, with a ceiling of -1.0 db for streaming platforms or -0.3 db for CDs. Set the IRC mode to IRC II (this is a modern digital model, don't use the default IRC I it will sound TERRIBLE).
6. Loop your recording back during the LOUDEST section of the song. This ensures that Tonal Balance Control will give an accurate reading.
7. Using Tonal Balance Control, get your 4 frequency zones as close to center as possible with the EQ.
8. Compression at this stage is optional (for me at least), since you most likely have applied compression to the piano during the mixing stage.
9. Open Youlean Loudness Meter, and play back your song from beginning to end. Note the integrated loudness.
10. You want an integrated loudness between -16 and -12 LUFS. Adjust the Maximizer's threshold and then replay the song from the beginning. Rinse and repeat until you reach the sweet spot.
11. Make a final check of your master on multiple sources (i.e. stereo, computer speakers, headphones, earbuds). There is naturally going to be slight differences between each source. I usually listen to the song next to some solo piano tracks from other artists to give proper context.
12. Make final adjustments based upon your listening periods.
That's it! Hope it helps.
PLUGIN LINKS
Ozone 9: https://www.izotope.com/en/products/ozone.html
Tonal Balance Control 2: https://www.izotope.com/en/shop/tonal-b...rol-2.html
Youlean Loudness Meter: https://youlean.co/youlean-loudness-meter/
Reference 4: https://www.sonarworks.com/reference
Pianoteq 7 | New York Steinway D, Hamburg Steinway D, Steinway B, Steingraeber E-272, Grotrian Concert Royale, Blüthner Model 1, K2 |
Roland FP-90 | Roland Rubix 22