I was of the impression that on the EQX, the tones relate DIRECTLY to the VDI -- a "one-to-one" correlation. In other words, if using 50-tones, we know that each of the 50 VDI numbers has a tone attached to it...AND, I thought it was the case with the EQX that the same algorithm that assigns a "tone," also assigns a "VDI." So, a 25 VDI has a "25" tone, a 26 VDI has a slightly higher-pitched "26" tone, etc. I do NOT think, but may be mistaken, that the machine has two different discrimination algorithms, i.e. that a "VDI" algorithm could assign a "25" to a target, but that there is a separate discrimination algorithm used for assigning tones, such that the same "25 VDI" target might get assigned a "26" or a "27" tone...
Now, even IF my understanding there is correct (and if someone can correct me, that would be great), that is NOT to say that there couldn't be a "nuance" in the tone that can be heard to help differentiate different traits of the target. In other words, the actual "pitch" of the tone would still be the same, but there may be some more subtle nuances that can be heard (duration of the tone, "loudness" of the tone, etc. etc.) A great example of this is a crushed can. While a shallow crushed can my offer the exact same VDI as a shallow quarter, AND the same "pitch" of tone thus assigned to the same target, you can still hear differences in the two -- the "loudness" of the tone, the "duration" of the tone, and perhaps a couple of other subtleties. But, I don't THINK it's the case (and again, perhaps someone can correct me) that you have one "VDI" algorithm that calculates a "number" for the target, and then a separate discrimination algorithm that calculates a "sound" for the target. The two SHOULD match, unless I'm mistaken...
Steve