Does anyone have a table or chart showing what frequencies correspond to the values for the OT’s filter and EQ settings? (e.g. LP filter set to 45 will allow frequencies below ?Hz to pass).
I found this one for the MD - is the OT the same?
This seems like a question that must have been answered but I simply can’t find it. I suspect my search skills are not up to scratch. So apologies in advance.
What will you do with this info? Is there something about having the numbers that is a bigger advantage over using ones ears?
The answer is that I don’t have a DAW and would like to learn to do what you are suggesting by using the OT. How can I ‘learn to use my ears’ without understanding what I’m listening to?
There are lots of tutorials that suggest things like ‘for kick drums, try cutting frequency x or boosting frequency y’. In order to apply such advice on the OT, yes I will need the values.
So in short, I am trying to improve my skills and knowledge.
love to know these values.
just for a particular mode of working that i don’t always actually do.
Bob Katz (i think) once wrote “Don’t sweep the Mids”…
essentially talking about the acclimatisation the ear experiences when listening to different eq values being changed continuously.
sometimes it really helps to set the eq on a particular frequency, then boost or attenuate that. if that works, then cool. if not, go to a different particular frequency band and try changing that.
whilst at the same time, not listening to all the other different frequencies in between being changed whilst sweeping the dial.
For mixing tracks i think the most important toolset would be the ears … then the mind, and after that, the heart.
wouldn’t be hard to determine these values to a reasonable degree of accuracy, simply use a sample of white noise, turn the Q all the way up, and then run it into a spectrum analyzer - there are free web based ones you can run your filtered/EQ’ed noise file through, no DAW or even audio interface required
Tutorials which mention specific kick drum frequencies for equing are bad for you 
Unless you are using the exact same kick, those freqs will be different in any given context.
Buuut, some white noise and a freq analyzer would show the values as suggested above. Would be useful info in any case…
Thanks for the suggestions.
My intention is not really to ‘get a perfect’ kick drum or whatever, but more as a theoretical learning tool (e.g. this is what it sounds like when you roll off frequencies below x kHz). OT just happens to be the piece of gear I have available to hear how the theory applies in practice.
I will try defenestrations idea- thanks. I guess in a way I was asking if anyone has already done something similar and would be willing to share the results.
Still keen to know if anyone can answer the original question!
I tired to measure the frequency of the OT equalizer a looong time ago. Im not sure if my measurements are really reliable some values seems strange to me 
Anyway here is what I found (left column = equalizer value, right = frequency in Hertz) :
6 8.075
10 10.7666
12 10.7666
14 13.4583
16 16.1499
22 21.5332
26 26.9165
28 32.2998
30 34.9915
32 40.3748
34 45.7581
36 51.1414
38 59.2163
40 67.2913
42 80.7495
44 86.1328
46 104.9744
48 118.4326
50 131.8909
52 156.1157
54 166.8823
56 196.4905
58 226.0986
60 247.6318
62 290.6982
64 336.4563
66 387.5977
68 427.9724
70 495.2637
72 565.2466
74 645.9961
76 726.7456
78 820.9534
80 944.7693
82 1087.4268
84 1246.2341
86 1426.5747
88 1579.9988
90 1833.0139
92 2088.7207
94 2339.0442
96 2723.9502
98 3095.3979
100 3520.6787
102 4059.0088
104 4519.281
106 5170.6604
108 5924.3225
110 6788.3423
112 7633.5205
114 8809.7717
116 10039.856
118 11417.981
120 13116.4124
122 14849.8352
124 16938.5559
126 19188.7756
whoa cool, so, i guess this relating to the two-band equaliser?
it’s great to have some vague idea of what is where and how much.
sometimes removing some of the 400-500hz range is helpful to lessen the boxiness of a drum loop or drum sample. this chart would indicate around 68-70 parameter value would be honing in on that area. Nice!
Yes that’s for the two-band equalizer !
I made these measurements initially to use the equalizer as a formant filter
And it works well !
Interesting. Seems the relationship is linear–log-Frequency
Much obliged for posting these findings! I’ll be sure to add these to my notes for future use.
Wonderful- thanks!
This looks like the LPF. But I’m pretty sure the HPF and LPF behave differently. And there is also a +/- 2 or even 3 value difference between the 12dB/oct & 24dB/oct filters. Plus keeking in mind that tweaking the HPF will change the freq of the LPF.
TBH I don’t think the freq & value correlate in a linear fashion, making them sound more “analog” than you would think (when sweeping).