The problem I envisage with the timeline is that if there is a regular (emphasis on regular) slowing down and speeding up of the platter between flashes the timeline will show perfect speed where the reality in realtime will be very different....a bit like the teacher who checks on a class every 2 minutes and sees a class of perfect angels but as soon as he/she goes out of the room the kids start running amok.
I like the idea of the Feickert app better BUT, in playing a steady tone on the test disc there is no way to really test differences in groove modulation and it's effect on stylus drag.
An experiment for those of you with multi-arm tables would be to play an LP with heavily modulated grooves with one arm and then have the 7" (3150Hz tone) Feickert disc sitting on top of the LP being played at the same time by the other arm. Obviously with only the test tone selected to play through the speakers using the app you could see the exact effects of stylus drag in realtime.
My own observation is that a centre hole that is even a tiny bit off centre (most records and IME especially modern 'audiophile' repressings) will cause audible pitch variations that totally SWAMP inherent differences between turntables. In testing my own turntables(both belt and direct drive)with the Feickert app this was certainly the case.
I like the idea of the Feickert app better BUT, in playing a steady tone on the test disc there is no way to really test differences in groove modulation and it's effect on stylus drag.
An experiment for those of you with multi-arm tables would be to play an LP with heavily modulated grooves with one arm and then have the 7" (3150Hz tone) Feickert disc sitting on top of the LP being played at the same time by the other arm. Obviously with only the test tone selected to play through the speakers using the app you could see the exact effects of stylus drag in realtime.
My own observation is that a centre hole that is even a tiny bit off centre (most records and IME especially modern 'audiophile' repressings) will cause audible pitch variations that totally SWAMP inherent differences between turntables. In testing my own turntables(both belt and direct drive)with the Feickert app this was certainly the case.