"fast" and "slur"?

[BachRules]

What is 'fast' in these patches:

• /A -  String patches/25 Violins appassionata/41 Sordino PERF INTERVAL FAST/01 VI-20_mu_perf-legato_fa
• /A -  String patches/25 Violins appassionata/41 Sordino PERF INTERVAL FAST/01 VI-20_mu_perf-legato_fa_slur

Is 'fast' describing the speed of the transition, or something else? The transition in

/A -  String patches/25 Violins appassionata/41 Sordino PERF INTERVAL FAST/01 VI-20_mu_perf-legato_fa

sounds slower than this one, which isn't called 'fast':

/A -  String patches/25 Violins appassionata/40 Sordino PERF INTERVAL/01 VI-20_mu_perf-legato_Vib

What is the 'fast' patch faster than?

Also, what does 'slurred' mean in these:

• /A -  String patches/25 Violins appassionata/40 Sordino PERF INTERVAL/01 VI-20_mu_perf-legato_slur
• /A -  String patches/25 Violins appassionata/41 Sordino PERF INTERVAL FAST/01 VI-20_mu_perf-legato_fa_slur

Does 'slurred' describe the speed of the transition, or does it describe something else?

The only thing I'm sure of is that 'port' has the slowest transition. I don't understand the differences among the rest of these perf-interval patches. Thanks

[DG]

Fast means that the transition is edited so that fast notes can be played. Slur adds a little portamento to the legato, so that the edges of the succeeding notes are blurred and not clean.

DG

[BachRules]

@Another User said:

fa: fast

fA: fast attack

[Paul]

Hi, 

@Another User said:

fa: fast

fA: fast attack

fast: fast transition

fA: fast attack (with single notes, with a modified attack)

Best,

Paul

[BachRules]

Thank you.