What happens to a nation's balance of trade when its currency depreciates?

If a country begins to decrease it currency and at the same time it has trade deficit. Than, this depreciation will increase the export volume of that country. Because of the domestic goods of that country are now available at lower rate. But it also depends upon the exchange rate of other countries either it is same or also changed. For example in 1997-98Asian crises, reduce the exchange rate of many Asian counties that cause an increase the demand of their products. Like Thailand exports of fish increased.