"Do i need to set the groundbalance and treshold also in de disc. mode??? of is it only need for hunting in all-metal mode.".... There are some definite differences between brands, and even between models from one maker. Some models have a Discriminate mode that is preset internally and is NOT tied in with the manual ground balance control, and some have circuitry where the Disc. mode IS tied into the manually-adjusted GB.
In the case of the Cortés, for example, the Disc. mode relies on a factory preset GB for the Disc. mode and the manual GB is only functional for the All Metal mode. So, while setting a 'proper' threshold and ground balance isn't necessary for operation in the Disc. mode, it is important in order to have good performance when you switch to All Metal to pinpoint a target.
The Eldorado, however, does have a circuit where the Disc. mode references off the GB setting made in All Metal.
"I know to do this in all metall but was wondering if i do not will it have bad effect in disc. mode??? because i always thought that treshold and grounbalnce in disc. mode was factory preset".... Yes, in the case of the Eldorado or earlier Bandido series best performance in the Discriminate mode is going to be associated with proper set-up and adjustment in the All Metal mode. This is not the case with the Cortés, however.
If you have any specific questions and would like to E-mail me directly, please feel welcomed to do so ... and remember to specify which model you are using as well as search coil(s).
Happy Hunting,
Monte montevon@aol.com