My types of soreness varies from time to time and I'd love to hear your thoughts on the significance of these particular brands.
1) Around the ends of the muscle, near insertion points only.
2) Spanning the entire length of the muscle.
3) Deep beneath the muscle
4) Pulsates and twitches, even painful at times, when approaching a specific band of ROM
(at times when my shoulder is sore and i lift it by my ear, i feel it contracting and twitching involuntarily)