jcl,

I should offer some clarification on how I expect this to work.

Zorro should anticipate that the absolute point of reference volume should occasionally reset. For example, the DTC protocol defines volume as "volume for this session". If, in this case, the connection is lost and must restart, volume will probably return to zero.

Pseudo-code:
if (AbsVolume[0] < AbsVolume[1]) VolumeSinceLastBrokerAssetCall = 0;