Conference napalm::commusic_v1

    yeah Mike, I've got just what you need - it stands about 4' high,
    weighs around 200# . . .
    					joe

    
    re: .-1
    
      But since you did... I have a model 45 Leslie, original tube amp,
    weighs about 125 pounds, Jensen speakers (original), beat up cabinet,
    not-original DC servo motors which I installed in 1978 when I was
    on the road and wanted slo-mo Leslie (infinite variability). I have
    a servo amp for it but I haven't even fired the thing up in 6 years,
    I've just been hauling it around because I couldn't bear to leave
    it behind...
    
      Of course, you've tried an Effectron? Lots cheaper, ever so much
    lighter, and it fits in a rack. Of course Deltalab is out of business
    now, but an Effectron in flange mode works pretty well if you make
    the delay time long enough.
    
    /pjh

    Is Deltalab really out of business?  I bought one of the very first
    ADM-1024's and it rapidly became  very important to me (I love delay
    effects and tricks).
    
    Anyway, I had to get it fixed once and was delighted to discover that
    their headquarters was just a ways down 93 from my place.  I have this
    recollection that they were bought out by someone rather than going
    out of business.
    
    Anyway, I sure hope not, cause it was really nice to bring the thing
    in on a Wednesday and have it back the following Monday.  Of course,
    it'll be a moot point when (and if) I get my H-3000.  ;-)
    
    	db

    
    Re: DeltaLab
    
    DeltaLab was bought up by ADS, and they do indeed do service at
    their plant in MA.  It's right off 93, I forget the town.
    
    However, I haven't seen anything new from them for a while....
    
    

    Apropos of a leslie effect, can anybody tell me what the leslie
    does (acoustically) to the sound?
    
    I have tried various combinations of filter cutoff, amplitude
    modulation and pitch modulation without complete success.
    
    Is the function triangular, sinusoidal, saw-tooth, square, or something
    else? 
    
    Thanks,
       Steph
    

    
    re: leslie effect
    
      The mathematics of the effect are horrendous but the physical
    act is pretty simple to understand.
    
      A Leslie, or rotating speaker system, usually consists of a two-way
    speaker system, which contains a downward-facing woofer and a horn
    midrange speaker. The horn driver faces upwards, and the horn itself
    is bent at about an 85 degree angle. If you peek at one you will
    notice two horns; actually, sound only comes out one of them, the
    other is plugged, and is there for mechanical balance. The woofer
    points downward into a rotating drum, which has an angled 45 degree
    baffle. The Leslie cabinet has louvers on both the bottom and the
    top, and although most cabinets have an unfinished backside, the
    louvers extend 360 degrees around the cabinet.
    
       The net result of a Leslie is to provide a Doppler effect by
    continuously redirecting sound in a radial pattern. The important
    thing to note is that there are two components to the sound from
    a Leslie, and they are treated differently: The midrange/high
    components are directly radiated (i.e. pointed at the walls and
    bounced), and the bass components are reflected first. This actually
    makes a difference, as anyone who has ever used a multi-speed Leslie
    knows. The Doppler effect is less pronounced when the speaker/drum
    is turning slowly (phase shift), and becomes much more pronounced
    when the speaker/drum is turning quickly (pitch shift). It's close
    to the effect of an Effectron or similar delay being set to a 50ms
    to 75 ms delay time, and modulated at about a 2-5% depth at a varying
    modulation frequency, and then feeding that output to a digital
    delay set for a medium-sized room. I shiver to think of the mathematic
    equation but it has a lot of sigmas and f(n)s in it. 
    
      The real trick is the bottom drum, which rotates at a different
    rate than the top, and especially, as you change speed, it winds
    down at a different rate than the horn (conversely, it winds up
    at a different rate).
    
      The other characteristic of the Leslie was that it was a hardwood
    box (at least mine is), and the woofer (15") is in a non-ported
    acoustic suspension box. Extremely characteristic sound provided
    by the enclosure itself is tough to duplicate. 
    
       Wonderful idea from a time that produced other such wonders as
    the echoplex, the spring reverb, and the whammy bar.
    
    /pjh
    

    Sometime in the recallable past there was an ad for and a review
    of a no-holds-barred leslie simulator in one of the music mags
    (keyboard or EM or MSO or something).  This rack mount unit even
    simulated the different speeds and rate of changes of speeds for
    the woofer and midrange systems.  It was a tad expensive, around
    $600 if I recall correctly (which I very well may not).  I doubt
    I can find the issue in question in the sea of magazines slowly
    threatening to take (if they haven't already taken) over my apartment.
    
    len.
    

    I think the box Len refered to is made by Dynacord.  I have never
    seen one, or heard one, but I too would be interested in hearing
    from someone who has.
    
    		Derek

    I have (somewhere) several articles on the development of the Leslie,
    as well as mathematical descriptions of the pipe-organ TREMULANT,
    on which the Leslie was based (or should I say, which the Leslie
    itself was attempting to simulate).  If you're interested, send
    me MAIL and I can dig these articles out ...
    
    	-Jim Laing   FGVAXZ::LAING

    As the owner of a Leslie 145, I have yet to find anything that produces
    quite the same overall sound and effect as the real thing.  I can
    use some help, however, in trouble shooting an occasional problem
    that I have with the beast.  At sporadic momments, particularly
    at fast speed, the breaker trips on the pre-amp.  Do I simply need
    new tubes, or should I be also seeking out a solid-state alternative?
    
    - Ken
    

    
    re: .-1
    
      Have you oiled your speaker bearings and the bearings on the drum
    lately? There are oil holes specifically for this purpose. If you
    have a higher load then the motor drive current might contribute...
    
      Which amp do you have in the 145? There were three different tube
    models. What type are your power tubes?
    
      /pjh

    It has a 147 amp, and a Leslie "Combo" preamp, which specifies use
    with 145's or 147's.  The output tubes are two 6550's.                 
                                           
    Cheers,
    Ken
    

    
    Hmm. When was the last time you changed the rectifier tube? And
    how old (and how many hours) on the tubes? 
    
    Of course, the breaker could be soft too...
    

    I replaced all the tubes, cleaned and lubed the motors, and...Voila!!!
    No more problem.
                                                            
    Thanks!!!                                               
    
    Ken-who-is-happy-to-have-his-leslie-back
     

    
    re: .-1
    
      bingo. How bad were the motors, out of curiosity?
    
      I ended up replacing the AC motors in my '45 with DC servo motors.
    Of course, it helped to be (at the time) a test technician in a
    DC servo motor factory... But it got me variable speed and less
    oiling. 
    
    /pjh

    I'm really not sure how bad they were, but they were dirty and noisy,
    and now they're clean and quiet.
    
    Cheers,
    Ken
    

    
    ahhh. That was the problem, then. more friction = more current.
    
    Happy tremulating.
    
    /pjh

    Anyone remember this note?
    
    I believe the unit folks are using is something called a CLS222 from
    Dynacord.
    
    I haven't been able to find anything on this unit at all at music
    stores or in back issues of _Keyboard_.
    
    Has anyone seen a review of this beast of even an ad?
    
    		Thanks,
    		Derek_who's_back_to_COMMUSIC_after_a_long_absence
    

    
    
    My local (tame) Music Shop is Dynacord main agent for the U.K. If
    you want me to dig into this in more detail. I.E. go and find out.
    Then let me know.
    
    					Paul.
    

    
    RE -1 Yeah Paul, that would be great if you could get some info.
    I've heard that these Dynacord units are good but expensive.
    
    Mike D

    Yes, I am also still interested.  If you get any brochures, etc.,
    could you send me a copy?   My mailstop is MLO1-2/C30.
    
    		Thanks,
    		Derek

    To resurrect an old topic, the Alesis Quadraverb has very nice Leslie
    simlulation algorithm.  And, since you can modulate up to 8 different
    parameters via MIDI CCs, the thing is quite flexible. 

    Modulation routings, off the topic of my head -

	1. STEREO SEPARATION	spread of treble/bass across stereo image
	2. MOTOR ON/OFF		gradual speed-up and slow-down!
	3. MOTOR SPEED		slow or fast, again gradual
	4. HI ROTOR LEVEL	to increase treble presence
	5. MIX LEVEL		wet/dry signal ratio

    Map aftertouch to 1, 2 & 3, mod wheel to 4 & 5 and you have a killer
    Leslie simulator.

    For what it's worth.

-b

I didn't think the Quadraverb leslie went fast enough.....

dbii

    This note is up and running again!
    
    I did not see an end to this conversation. Is the Quadraverb able
    to create a _GOOD_ leslie effect and could the "motor speed" be
    varied with an on/off pedal??
    
    Torbjorn
    

re: QV questions

define good, I think it's ok, the motor speed doesn't go fast enough for me

yes you can control the speed with a pedal I think.....seems like you can 
control any parameter with a pedal

dbii

    The QV leslie sounds pretty good to me- however the "motor speed" is 
    either FAST or SLOW,  no continuous control.  They _could_ have done
    continuous control, because it doesn't switch between fast and slow
    instantly, it takes several seconds and the QV simulates the sound
    of a Leslie spooling up.  So, clearly, there's a word in memory
    somewhere that is the current "leslie speed"; but you can't
    get to it from MIDI.  (at least I don't know how to get to it.)
    
    	-Bill
    

    Ok, thanks for your input. Next question regarding spinning up and
    down; Is it slowly spinning BOTH up and down? i.e when you go from
    SLOW to FAST and and also when going from FAST to SLOW. 
    
    I think this effect is the most unique in leslie simulation.
    Is the FAST and SLOW speeds programmable ( I know they are not
    controlled via MIDI commands) in the QV preset? Is the stereo effect
    heavy noticable??
    
    As I'm currently investigating in getting another FX (already have
    a MV II), getting one with a fairly good leslie simulation is
    preferred. Are there any other similar multi FX (ART??) with leslie
    simulation??
    
    Torbjorn
    

    Nope, the speeds at FAST and SLOW are not programmable, nor is the
    rate programmable.  And yes, it does take it's time both spooling
    up and spooling down. (and the rates are different, as I recall).
    
    The stereo effect can get pretty heavy.
    
    	-Bill