bwood301 Posted December 4, 2014 Share Posted December 4, 2014 The original 122 and 147 leslies rotated at around 400 RPMs for the fast speed and around 40 RPMs for the slow or chorale speed. Can anyone relate those to the FastRate and SlowRate parameters of the rotary effect in the DSP? For example what SlowRate setting would approximate 40 RPMs? Likewise for the FastRate setting. Quote Link to comment Share on other sites More sharing options...
Brad Saucier Posted December 5, 2014 Share Posted December 5, 2014 As far as I know, nobody has attempted to compare RPM's to the midi 0-127 parameters of the rotary effect. Quote Link to comment Share on other sites More sharing options...
Choppin Posted December 5, 2014 Share Posted December 5, 2014 My suggestion would be to do some math and get a rough guess: 400/127 = ~3 rpm units per midi value . So 40 rpms ~13 midi units and 400 rpms ~127 midi units . Quote Link to comment Share on other sites More sharing options...
Joe Muscara Posted December 6, 2014 Share Posted December 6, 2014 [Pedantic rant] RPM stands for Rotations or Revolutions Per Minute, so you don't need to have an "s" in the abbreviation as it's already accounted for. It's just RPM. In other words, saying or writing "RPMs" would be like saying "MPHs" or "KPHs" [/Pedantic rant] Sorry, that is one of the things that bugs the engineer in me. To add to this discussion, I wonder if it would be worth the time for someone to count the apparent cycles of the rotary effect. You could listen while it's on slow and see how many peaks you hear per minute, and also try to do that for the fast speed though that might be difficult. Personally, if I really care about the accuracy of the rotary effect that much, I'm just going to use my GSi Burn. Quote Link to comment Share on other sites More sharing options...
bwood301 Posted December 8, 2014 Author Share Posted December 8, 2014 Point taken Joe.I agree that a Leslie sim box is a better choice.For kicks I put a digital scope on the output of the PX. I found the SlowRate setting of 30 is close to 40 RPM. The max setting of 127 is about 240 RPM. On the FastRate a setting of 69 is close to 400 RPM. The max setting of 127 is about 950 RPM. I tried using a spectrum analyzer but couldn't get it to scan correctly. Probably operator error. 1 Quote Link to comment Share on other sites More sharing options...
Joe Muscara Posted December 8, 2014 Share Posted December 8, 2014 You went more high tech than I was thinking! Thanks for the info. It's a useful reference for others in the future. Did you set them to 30 and 69? How does it sound? Quote Link to comment Share on other sites More sharing options...
bwood301 Posted December 8, 2014 Author Share Posted December 8, 2014 Joe - Must be the engineer in me I'm using 30 for the Slow Rate and 100 for the Fast Rate (approx. 650 RPM). A real Hammond player would probably shoot me. The Rotary effect "beats" against the organ tone so it's probably a matter of personal taste. I used a sin wave tone to generate the data so I could see it easier on the scope. I've attached a table of what I found. I'm sure the numbers are a little off because I believe they should fit some kind of curve. I'm going to buy the GSI Burn or the Ventilator II soon so it's probably moot for me. I'll start a new thread to see which one the group likes with the PX and why. Barry Rotary Table.pdf 1 Quote Link to comment Share on other sites More sharing options...
Joe Muscara Posted December 9, 2014 Share Posted December 9, 2014 Joe - Must be the engineer in me I have one of those too! I try to keep it simple and not shoot over people's heads when replying though, as I never know if they can figure out what I'm talking about. I must be getting good at it. (Not that your posts have been techy nor over people's heads.) Quote Link to comment Share on other sites More sharing options...
PAULD Posted February 27, 2018 Share Posted February 27, 2018 on CTK7200 I have found rotary speeds of 40 for slow and 88 for fast best matches the Leslie tone cabinet Quote Link to comment Share on other sites More sharing options...
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