crosstalk is created over several different paths... noise moves around similar paths...
electrostatic... capacitive leakage across wires in ribbon cables and traces on circuit boards will be loaded toward higher frequencies. If you view two circuit board traces that are next to each other as plates of a capacitor the equivalent resistance to crosstalk between them will go down as frequency goes up. This is on common characteristic of crosstalk in analog desks.
inductive... every wire - even a straight wire - has an inductive component. If you view two circuit board traces that are next to each other as wire turns in a transformer the equivalent resistance to crosstalk between them will go down as frequency goes down... I have not found this to be as dominant a source of cross talk as electrostatic coupling (high frequency) in analog desks but it is a factor.
resistive... this is pretty huge. Circuit "Common" (or Ground, or Zero Volts) should be as near zero impedance as possible and all source (sink) to a central point that can be referred to as a master ground or master common... the lowest impedance point in the console. This can be a buss bar or a central lug or some other central distribution point... not that I call it a distribution point. Circuit common is almost always zero volts and is almost always going to be tied to ground. If a group of four channels are tied properly to a common but the common they are tied to has some resistance to ground then the channels will more easily bleed signal to each other than they will to ground. This type of crosstalk tends to be full bandwidth.
combinations... an inductance in the path to ground will allow low frequencies to have a low impedance common circuit reference while high frequencies will see a less low impedance reference... so highs will be more likely to cross talk.
an aggravator... one large problem in many consoles is the insert point and unbalanced INPUTS in general. If you take any device that has a actively balanced transformerless output and plug that in to an unbalanced input such that the "low side" of the active balanced output is feeding in to ground you will create a crosstalk problem. The reason is that active balanced outputs are two amplifiers driving - say, pin 2 and pin 3 of an xlr - they are driving the pins - the hi and the low - out of phase, but in all other respects, identically. This is a differential signal and can be called balanced. When you plug one of these outputs into an unbalanced input you will short one of the two amplifiers to ground and in many cases the remaining amplifier will shift level up by 6dB the compensate for the loss of half the signal. So... the amplifier shorted to ground does not turn off and does not stop driving audio current to ground. It will distort because it is driving a short. What happens in the distorted audio current travels on an imperfect ground and some of it will distribute into parts of the console, like buss amplifiers, where you can hear it. A current passing through anything with a resistance will create a voltage and in this case it a distorted harmonically rich noise voltage.
In many mid range consoles the crosstalk will be high frequency as more or less "clean" capacitive couple leakage, mixed with some distorted midrange active-output-half-shorted-to-ground crud, mix with some more of less full range stuff.
So... if you want to replicate that you would make the crosstalk in your workstation by taking the signal and boosting the high end by 6dB per octave or so and then mixing that with the same signal that has been passed through some sort of exciter... if it was an analog device I'd say you wanted to oldest Aphex Exciter you can find but, in the land of plugs you are on your own. You would want to have the high end leak stuff down to around -70 or so at 10K and the gritty distortion (which you'll have to mess with to get it just right) maybe at -60 in the upper mid-band. Generally you'd cut all the low end off the grunge. Transformer input consoles don't have the grunge problem so if you want a more Neve-like crosstalk you bail on the grunge thing and keep all the crosstalk really clean and low