For your stated purposes, (No, likely not) because the new Music software enhancement is only available for L90 and L70. It was left as unclear what twilkins10 was seeking. He was concerned that scaling back to the L50 would drop the Music software enhancement. Perhaps your question at the end of that thread may clear things up?
Aside from the new Music software enhancement I only see two new software enhancements that the L90 has over the L70;
- Speech Sensor
- Speech Enhancer
These differences also, (but even less important) as related to your guitar;
- Comfort in Echo
- Speech in Car
- Speech in Loud Noise
- Comfort in Echo
- EchoBlock
Here’s what some say about the L90 and L70 new Music software enhancement.