[1.4.0] Tempo FX is broken

[G0JPS]

Tempo in the FX channel should be absolute values! Changing it to a percentage in 1.4.0 has ruined a lot of my songs.

For example, spoken intros to a track that plays at 160 bpm.
In 1.3.1, FX T=10 (lowest value) would set 10bpm
In 1.4.0, FX T=10 now sets 16bpm, and all the parts play out of time.

Other important information

• How often does this bug happen? (every time, often, "it only happened once")

• Every time whilst running 1.4.0 firmware

• Does this bug happen in previous firmware versions?

• Not in 1.3.1 or 1.2.0

• Does this bug happen in every project?

• Only the ones that use a Tempo FX.