
Originally Posted by
MilesAway
Some of the newer pads, like the VAD floor tom or digital snare have more sensors. This means they are capable of more accurate positional sensing, which replicates the different tonalities a drum provides depending on where you strike the head. This also provides more dynamic accuracy and sensitivity away from the center of the head. Also, some of the new pads feature a triple-ply cross woven mesh. Extra plies of mesh mean greater triggering accuracy, because they aren't vibrating extraneously, and a more authentic acoustic-style feel.
There's also been a focus on larger pads with more acoustic-style profiles - either full sized shells from the VAD line, or "regular" pads with a larger diameter and more realistic rim placement\height. The benefit here is restricted to feel of course, but it helps.
The new digital pads feature electrostatic sensors, which sense things like your hand resting on the drum (no more misfiring cross-stick samples, and you can mute the ride with a finger tip etc). These pads are a lot more sensitive, but of course you only access the benefits of that sensitivity with an appropriately capable module.
The biggest changes over time are found within the modules - more realistic samples, more sophisticated sound engines that "select" and process those samples according to your performance, and greater editing capabilities. USB Interfaces are becoming the norm, as is Bluetooth. That said, even small factors, like the harness\mount that keep the sensor cone in place under the head make a difference in triggering accuracy in reliability. Keep in mind a lot of the pads last longer than the modules they are introduced with... the PD-8 for example was used on iterations of the TD-9, TD-11, TD-15 and TD-17 kits, long after the first of those was discontinued.
The actual triggering technology that all manufacturers use has stayed pretty much the same since the inception of the digital drum... there have been improvements to the sensors, mounts, etc, but the actual technology is basically the same (other than the aforementioned digital pads, unique to Roland).
I'm not sure about the states, but there have been many price jumps in the Canadian music instrument retail industry in the last decade... some of them pretty significant. Obviously inflation is always a factor, but gear is getting pricey regardless.
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