FamiStudio 1.4.0 was just released!

New features:

• VRC6 audio expansion support
• Slide notes
• Vibrato effect
• Workaround "pops" on square channels (Blargg's smooth vibrato technique)
• NSF improvements
• Ability to remove attack on notes
• Relative pitch envelopes

Breaking/behavior changes:

• Jumps and skips will now be applied at the END of the frame, as opposed to the beginning. This is how FamiTracker and the rest of the world does it.