If you use Metastock 4 datafeed
It is possible in Timing Solution to download Forex data using Metastock 4 datafeed.
Using of this data feed involves three players:
1) Metastock 4;
2) Currency Loader program that stores MT4 data into some file;
3) and Timing Solution software that reads that file.
If you plan to use MT4 as a source of data, we highly recommend to check how this procedure work.
The explanation regarding this subject is here: http://www.timingsolution.com/TS/Mini/34/index.htm
You can check how this procedure works with Demo version (there are restrictions in Demo regarding data feed features).
You can also ask a question regarding this subject on Timing Solution Yahoo Group, the Group is very supportive.