Winston,
Volume = Total number of shares traded
Turnover = Price X volume.
Substituting volume with turnover will not give you the complete picture. Of course, if you watch the volume bars carefully, you will notice at what particular price demand/supply came in. Intraday charts give this picture very clearly. You can achieve the same result by utilising volume at price indicator in Amibroker. How many of us are using that? If you combine volume and delivery figures with volume at price, you may get better and clearer picture. Hope this helps.