As shown in this post, nkululeko can be used to investigate correlations of specific features with a target variable.

Now nkululeko can also be used to check on correlation between two real-valued acoustic features.

With the key regplot you can specify two features and optionally a target variable (if omitted, the ini-file target is used) like so:

[EXPL]
regplot = [['lld_mfcc3_sma3_median', 'lld_mfcc1_sma3_median'],
['lld_mfcc3_sma3_median', 'lld_F2frequency_sma3nz_median', 'age']]

The first tuple of features is related to the emotion target (default for this example data: emodb) and would produce this plot:

The second line states age as the target, which is a continuous target and thus will be grouped