[linux-audio-user] Free-as-in-Freedom B3s, comment

[Nick Copeland]

>Briefly, you've got a pair of speakers that can spin.  They are driven
>by separate motors.  At slow speed they run at about 25-30 rpm, at high
>speed they run at about 360-400rpm (around 0.3-0.5Hz and around 6-7Hz
>modulation rate).  The two motors are unsynced and take different
>amounts of time to spin up.

Nice email. There were also a lot of modified cabinets such as a single 
spindle as some users did not like the unsynchronised sweeps, they felt 
there was more depth with a single rotation so decoupled the horn motor and 
linked them up to the bass spindle.

Some preferred alternatively to just remove the bass motor all together as 
the thing did tend to be slow starting - with just the horns sweeping there 
was generally better response from the cabinet for a degree of lost leslie 
quality that was often lost in the mic positioning for live work anyway.

There were also modifications that added a breaking system, at least to the 
bass spindle, to get it to slow down at a reasonable rate.

Some Hammond users were also known to put a belt 'break' on the main 
tonewheel motor to get pitch bend out of the actual organ although I think 
that was generally frowned upon as it was a mains AC synchronised motor that 
did not originally autostart - it needed a separate 'starter coil' to make 
it spin in the first place.

Bristol emulates all these features, albeit in a cheesy sort of way. They 
are all reasonably easy to build into the algorithm once you have the signal 
separated into the high and low speaker rotation algorithms.

Nick.

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